diff --git a/du3/program.c b/du3/program.c
index d3572b3..7501235 100644
--- a/du3/program.c
+++ b/du3/program.c
@@ -37,7 +37,7 @@ float IsArithCorrect(float num1, float num2, char op, float result)
 
     if (calcResult == result)
     {
-        return 0;
+        return 1;
     }
     return 0;