diff --git a/algorithmic/problems/22/checker.cpp b/algorithmic/problems/22/checker.cpp
index 89d4fc0ca..a7d9a6392 100644
--- a/algorithmic/problems/22/checker.cpp
+++ b/algorithmic/problems/22/checker.cpp
@@ -117,10 +117,9 @@ int main(int argc, char* argv[]) {
         if (cnt != (int)nodes.size()) quitf(_wa, "S_%d is not connected in new tree (%d of %d reachable)", j, cnt, (int)nodes.size());
     }
 
-	double ratio = max(0.0, min(1.0, 1.0 * (5 * N - K) / 2 * N));
-    double unbounded_ratio = max(0.0, 1.0 * (5 * N - K) / 2 * N);
+	double ratio = max(0.0, min(1.0, 1.0 * (5 * N - K) / (2 * N)));
+    double unbounded_ratio = max(0.0, 1.0 * (5 * N - K) / (2 * N));
 	char mes[128];
 	sprintf(mes, "Ratio: %lf, RatioUnbounded: %lf", ratio, unbounded_ratio);
 	quitp(ratio, "%s", mes);
 }
-