diff --git a/y2024/src/days/d17.rs b/y2024/src/days/d17.rs
index b3e248b..ec7cfa8 100644
--- a/y2024/src/days/d17.rs
+++ b/y2024/src/days/d17.rs
@@ -63,17 +63,22 @@ pub fn process_part2(input: &str) -> u32 {
         .collect_vec()
         .concat();
     let mut a = 0;
-    loop {
-        registers.insert("A", a);
-        let out = exec_program(instructions.clone(), &mut registers);
-        if out == orig {
-            println!("{orig:?}");
-            println!("{out:?}");
-            break;
-        }
-        a += 1;
-    }
+    for idx in 1..=orig.len() {
+        let target = orig[orig.len() - idx..].to_vec();
 
+        let mut new_a = a << 3;
+        loop {
+            registers.insert("A", new_a);
+            let out = exec_program(instructions.clone(), &mut registers);
+            println!("target {target:?}");
+            println!("output {out:?}");
+            if out == target {
+                a = new_a;
+                break;
+            }
+            new_a += 1;
+        }
+    }
     a
 }