diff --git a/src/days/day01.zig b/src/days/day01.zig
index df9fec0..7a77996 100644
--- a/src/days/day01.zig
+++ b/src/days/day01.zig
@@ -12,16 +12,18 @@ pub fn run(_: std.mem.Allocator) !void {
     var zero_hits: u32 = 0;
 
     while (lines.next()) |line| {
+        if (line.len == 0) continue;
+
         const direction: Direction = if (line[0] == 'L') .left else if (line[0] == 'R') .right else continue;
         const amount = try std.fmt.parseUnsigned(u32, line[1..], 10);
 
-        zero_hits += try updatePosition(&position, direction, amount, 100);
+        try updatePosition(&position, &zero_hits, direction, amount, 100);
+        // Part 1:
+        // if (position == 0) {
+        //     zero_hits += 1;
+        // }
 
         std.debug.print("{s} => {d}\n", .{line, position});
-
-        if (position == 0) {
-            zero_hits += 1;
-        }
     }
 
     var buffer: [8]u8 = undefined;
@@ -40,29 +42,28 @@ const Direction = enum {
 
 fn updatePosition(
     position: *u32,
+    zero_hits: *u32,
     direction: Direction,
     amount: u32,
     upper_bound: u32,
-) !u32 {
-    var signed_position: i32 = @intCast(position.*);
-
+) !void {
     switch (direction) {
         .left => {
-            signed_position -= @intCast(amount);
+            for (0..amount) |_| {
+                if (position.* == 0) position.* = upper_bound;
+                position.* -= 1;
+                if (position.* == 0) zero_hits.* += 1;
+            }
         },
         .right => {
-            signed_position += @intCast(amount);
+            for (0..amount) |_| {
+                position.* += 1;
+                if (position.* == 100) {
+                    zero_hits.* += 1;
+                    position.* = 0;
+                }
+            }
         },
     }
-
-    if (signed_position > upper_bound - 1 or signed_position < 0) {
-        const signed_upper_bound: i32 = @intCast(upper_bound);
-        const mod = @mod(signed_position, signed_upper_bound);
-        position.* = @intCast(mod);
-        return 0;
-    } else {
-        position.* = @intCast(signed_position);
-        return 0;
-    }
 }