diff --git a/du4/program.c b/du4/program.c
index 8679b8e..44f6d2b 100644
--- a/du4/program.c
+++ b/du4/program.c
@@ -80,5 +80,10 @@ int main() {
         }
     }
 
+    free(number1);
+    free(number2);
+    free(result);
+    free(input);
+
     return 0;
 }
\ No newline at end of file