diff --git a/build.zig b/build.zig
index 04934e3..c93697a 100644
--- a/build.zig
+++ b/build.zig
@@ -12,7 +12,7 @@ pub fn build(b: *std.build.Builder) void {
     const mode = b.standardReleaseOptions();
 
 
-    const days = [_]u8{1, 2};
+    const days = [_]u8{1, 2, 3};
 
     for (days) |day| {
         const dayPath = b.fmt("src/day{}.zig", .{day});
diff --git a/inputs/day3.txt b/inputs/day3.txt
new file mode 100644
index 0000000..0c99dca
--- /dev/null
+++ b/inputs/day3.txt
@@ -0,0 +1,300 @@
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\ No newline at end of file
diff --git a/src/day3.zig b/src/day3.zig
new file mode 100644
index 0000000..019d07f
--- /dev/null
+++ b/src/day3.zig
@@ -0,0 +1,77 @@
+const std = @import("std");
+
+pub fn find_intersection2(array1: []u8, array2: []u8) ?u8 {
+    for (array1) |item1| {
+        for (array2) |item2| {
+            if (item1 == item2) {
+                return item2;
+            }
+        }
+    }
+
+    return null;
+}
+
+pub fn find_intersection3(array1: []u8, array2: []u8, array3: []u8) ?u8 {
+    for (array1) |item1| {
+        for (array2) |item2| {
+            for (array3) |item3| {
+                if ((item1 == item2) and (item2 == item3)) {
+                    return item3;
+                }
+            }
+        }
+    }
+
+
+    return null;
+}
+
+pub fn get_priority_value(val: u8) u32 {
+    if (val >= 'a') {
+        return @intCast(u32, val) - 'a' + 1;
+    }
+    else {
+        return @intCast(u32, val) - 'A' + 27;
+    }
+}
+
+pub fn main() !void {
+    var file = try std.fs.cwd().openFile("inputs/day3.txt", .{});
+    defer file.close();
+
+    var buf_reader = std.io.bufferedReader(file.reader());
+    var in_stream = buf_reader.reader();
+
+    var buf: [1024]u8 = undefined;
+    var pirority_sum1: u32 = 0;
+    var pirority_sum2: u32 = 0;
+    var line_number: u32 = 0;
+    var group: [3][1024]u8 = [3][1024]u8 {[_]u8{0} ** 1024, [_]u8{0} ** 1024, [_]u8{0} ** 1024};
+    while (try in_stream.readUntilDelimiterOrEof(&buf, '\n')) |line| {
+        const len = line.len;
+
+        var compartment1 = line[0..len/2];
+        var compartment2 = line[len/2..];
+
+        const intersection = find_intersection2(compartment1, compartment2).?;
+
+        pirority_sum1 += get_priority_value(intersection);
+        
+        std.mem.copy(u8, &group[line_number % 3], line);
+
+        if ((line_number % 3) == 2) {
+            const intersection2 = find_intersection3(&group[0], &group[1], &group[2]).?;
+
+            pirority_sum2 += get_priority_value(intersection2);
+
+            std.mem.set([1024]u8, &group, [_]u8{0}**1024);
+        }
+
+        line_number += 1;
+    }
+
+
+    std.debug.print("PART1 Sum of all priorties is: {}\n", .{pirority_sum1});
+    std.debug.print("PART2 Sum of all priorties is: {}\n", .{pirority_sum2});
+}
\ No newline at end of file
diff --git a/src/utils.zig b/src/utils.zig
new file mode 100644
index 0000000..e69de29