diff --git a/benchmark.zig b/benchmark.zig
index d05bdcd..c5a8781 100644
--- a/benchmark.zig
+++ b/benchmark.zig
@@ -12,6 +12,8 @@ const d42 = @import("day4/part2.zig");
 const d51 = @import("day5/part1.zig");
 const d52 = @import("day5/part2.zig");
 const d61 = @import("day6/part1.zig");
+const d71 = @import("day7/part1.zig");
+const d72 = @import("day7/part2.zig");
 
 const NUMBER_OF_RUN = 1000;
 
@@ -40,7 +42,10 @@ pub fn main() !void {
     try benchmark(d52.main, 5, 2);
     separator();
     try benchmark(d61.main, 6, 1);
-    print("| 6   | 2    |          Too long |        0 |        0 |\n", .{});
+    print("| 6   | 2    |     Too long ~60s |        0 |        0 |\n", .{});
+    separator();
+    try benchmark(d71.main, 7, 1);
+    print("| 7   | 2    |    Too long ~0.2s |        0 |        0 |\n", .{});
     separator();
     print("| Total      | {d: >8} ± {d: <6.2} | {d:>8} | {d:>8} |\n", .{ total_mean, total_std_dev, total_min, total_max });
     separator();
diff --git a/day7/input b/day7/input
new file mode 100644
index 0000000..11adc90
--- /dev/null
+++ b/day7/input
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diff --git a/day7/part1.zig b/day7/part1.zig
new file mode 100644
index 0000000..59813e7
--- /dev/null
+++ b/day7/part1.zig
@@ -0,0 +1,89 @@
+const std = @import("std");
+const print = std.debug.print;
+
+// Look like the complexity is 2 ^ (n - 1)
+// with n len of a int list
+//
+// So that mean I need to do
+
+const Operator = struct {
+    value: usize,
+    list: []usize,
+};
+
+pub fn main() !void {
+    // const test_value = "190: 10 19\n3267: 81 40 27\n83: 17 5\n156: 15 6\n7290: 6 8 6 15\n161011: 16 10 13\n192: 17 8 14\n21037: 9 7 18 13\n292: 11 6 16 20";
+
+    var gpa = std.heap.GeneralPurposeAllocator(.{}){};
+    const allocator = gpa.allocator();
+    defer {
+        const deinit_status = gpa.deinit();
+        if (deinit_status == .leak) @panic("TEST FAIL");
+    }
+
+    const file = try std.fs.cwd().openFile("day7/input", .{});
+    defer file.close();
+
+    const file_size = (try file.stat()).size;
+    const buffer = try allocator.alloc(u8, file_size);
+    defer allocator.free(buffer);
+
+    _ = try file.readAll(buffer);
+
+    var iter = std.mem.split(u8, buffer[0..file_size], "\n");
+    var total: usize = 0;
+    while (iter.next()) |line| {
+        if (std.mem.eql(u8, line, "")) continue;
+        total += try parseOperator(line);
+    }
+
+    try std.testing.expectEqual(882304362421, total);
+}
+
+fn parseOperator(line: []const u8) !usize {
+    var number_buff: [12]usize = undefined;
+    var result_buff: [2048]usize = undefined; // 2 ^ 11
+
+    var main_split = std.mem.split(u8, line, ":");
+    const left_value: usize = try std.fmt.parseInt(usize, main_split.next().?, 10);
+
+    var iter = std.mem.split(u8, main_split.next().?, " ");
+    _ = iter.next(); // Skip the first space after :
+    var len: usize = 0;
+    while (iter.next()) |number| {
+        defer len += 1;
+        number_buff[len] = try std.fmt.parseInt(usize, number, 10);
+    }
+
+    // So here I need to iterate over all combinaison of + and *, how can I do that ?
+    // I can do a tree with 2 branch at each step, the result of the new node is the entry value + or * current node
+    // But I need keep in memory all previous number, it's useless, I just need to know the value of all combinaison of the list
+    // Im sure I can take advantages that operations are done left to right, it would be even easier
+    // So I start with an empty usize list -> I take the 2 fist value -> I do + and * and add them to the list ->
+    // -> Take the next number, and do + and * on all of what is inside the list, remove previous item and add them to the list
+    // -> Do that over and over until the end and check how  many left value are in the list
+
+    result_buff[0] = number_buff[0];
+    for (0..len - 1) |i| {
+        const number_count = std.math.pow(usize, 2, i); // This is the number of value in the result buffer
+
+        // For all number in the list, I add them + new value at the end of the list (number_count + index) and then replace themself by them * new_value
+        for (0..number_count) |j| {
+            result_buff[number_count + j] = result_buff[j] + number_buff[i + 1];
+            result_buff[j] = result_buff[j] * number_buff[i + 1];
+        }
+    }
+
+    // Now I have all result of all combinaison of the list, I just need to check how many are left_value
+    const all_results = result_buff[0..std.math.pow(usize, 2, len - 1)];
+
+    var total: usize = 0;
+    for (all_results) |result| {
+        if (result == left_value) {
+            total += left_value;
+            break;
+        }
+    }
+
+    return total;
+}
diff --git a/day7/part2.zig b/day7/part2.zig
new file mode 100644
index 0000000..8ce7f56
--- /dev/null
+++ b/day7/part2.zig
@@ -0,0 +1,96 @@
+const std = @import("std");
+const print = std.debug.print;
+
+// Look like the complexity is 2 ^ (n - 1)
+// with n len of a int list
+//
+// So that mean I need to do
+
+const Operator = struct {
+    value: usize,
+    list: []usize,
+};
+
+pub fn main() !void {
+    // const test_value = "190: 10 19\n3267: 81 40 27\n83: 17 5\n156: 15 6\n7290: 6 8 6 15\n161011: 16 10 13\n192: 17 8 14\n21037: 9 7 18 13\n292: 11 6 16 20";
+
+    var gpa = std.heap.GeneralPurposeAllocator(.{}){};
+    const allocator = gpa.allocator();
+    defer {
+        const deinit_status = gpa.deinit();
+        if (deinit_status == .leak) @panic("TEST FAIL");
+    }
+
+    const file = try std.fs.cwd().openFile("day7/input", .{});
+    defer file.close();
+
+    const file_size = (try file.stat()).size;
+    const buffer = try allocator.alloc(u8, file_size);
+    defer allocator.free(buffer);
+
+    _ = try file.readAll(buffer);
+
+    var iter = std.mem.split(u8, buffer[0..file_size], "\n");
+    var total: usize = 0;
+    while (iter.next()) |line| {
+        if (std.mem.eql(u8, line, "")) continue;
+        total += try parseOperator(line);
+    }
+
+    try std.testing.expectEqual(145149066755184, total);
+}
+
+fn parseOperator(line: []const u8) !usize {
+    var number_buff: [12]usize = undefined;
+    var result_buff: [177147]usize = undefined; // 3 ^ 11
+
+    var main_split = std.mem.split(u8, line, ":");
+    const left_value: usize = try std.fmt.parseInt(usize, main_split.next().?, 10);
+
+    var iter = std.mem.split(u8, main_split.next().?, " ");
+    _ = iter.next(); // Skip the first space after :
+    var len: usize = 0;
+    while (iter.next()) |number| {
+        defer len += 1;
+        number_buff[len] = try std.fmt.parseInt(usize, number, 10);
+    }
+
+    // So here I need to iterate over all combinaison of + and *, how can I do that ?
+    // I can do a tree with 2 branch at each step, the result of the new node is the entry value + or * current node
+    // But I need keep in memory all previous number, it's useless, I just need to know the value of all combinaison of the list
+    // Im sure I can take advantages that operations are done left to right, it would be even easier
+    // So I start with an empty usize list -> I take the 2 fist value -> I do + and * and add them to the list ->
+    // -> Take the next number, and do + and * on all of what is inside the list, remove previous item and add them to the list
+    // -> Do that over and over until the end and check how  many left value are in the list
+
+    result_buff[0] = number_buff[0];
+    for (0..len - 1) |i| {
+        const number_count = std.math.pow(usize, 3, i); // This is the number of value in the result buffer
+
+        // For all number in the list, I add them + new value at the end of the list (number_count + index) and then replace themself by them * new_value
+        for (0..number_count) |j| {
+            result_buff[number_count + j] = result_buff[j] + number_buff[i + 1];
+            result_buff[number_count * 2 + j] = try concat(result_buff[j], number_buff[i + 1]);
+            result_buff[j] = result_buff[j] * number_buff[i + 1];
+        }
+    }
+
+    // Now I have all result of all combinaison of the list, I just need to check how many are left_value
+    const all_results = result_buff[0..std.math.pow(usize, 3, len - 1)];
+
+    var total: usize = 0;
+    for (all_results) |result| {
+        if (result == left_value) {
+            total += left_value;
+            break;
+        }
+    }
+
+    return total;
+}
+
+fn concat(left: usize, right: usize) !usize {
+    var buff: [16]u8 = undefined;
+    const value_str = try std.fmt.bufPrint(&buff, "{d}{d}", .{ left, right });
+    return try std.fmt.parseInt(usize, value_str, 10);
+}