diff --git a/src/mull_it_over.gleam b/src/mull_it_over.gleam
index 52a0c95..e5c3944 100644
--- a/src/mull_it_over.gleam
+++ b/src/mull_it_over.gleam
@@ -8,23 +8,18 @@ pub fn process_isr(instr: String) -> Int {
   let assert Ok(args_rex) = regexp.from_string("\\d{1,3}")
   regexp.scan(args_rex, instr)
   |> list.map(fn(x) { x.content })
-  |> list.map(fn(x) { result.unwrap(int.parse(x), 0) })
+  |> list.map(fn(x) { result.unwrap(int.parse(x), -1) })
   |> list.fold_right(1, int.multiply)
 }
 
 pub fn process_cond_isr(state: #(Bool, Int), instr: String) -> #(Bool, Int) {
-  case state {
-    #(True, x) ->
-      case instr {
-        "do()" -> #(True, x)
-        "don't()" -> #(False, x)
-        _ -> #(True, int.add(process_isr(instr), x))
-      }
-    #(False, x) ->
-      case instr {
-        "do()" -> #(True, x)
-        "don't()" -> #(False, x)
-        _ -> #(False, x)
+  case instr {
+    "do()" -> #(True, pair.second(state))
+    "don't()" -> #(False, pair.second(state))
+    _ ->
+      case pair.first(state) {
+        True -> #(True, int.add(process_isr(instr), pair.second(state)))
+        False -> #(False, pair.second(state))
       }
   }
 }
@@ -34,7 +29,7 @@ pub fn solve_a(input: String) -> Int {
 
   regexp.scan(rex, input)
   |> list.map(fn(match) { match.content })
-  |> list.map(process_isr(_))
+  |> list.map(process_isr)
   |> list.reduce(int.add)
   |> result.unwrap(0)
 }