diff --git a/src/main.rs b/src/main.rs
index 60212cc..48fdae4 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -2,11 +2,12 @@ use std::fs;
 use std::io;
 
 struct Position {
-    x: i32,
-    y: i32,
+    x: u32,
+    y: u32,
 }
 
 struct Robot {
+    id: u32,
     o: Orientation,
     p: Position,
 }