diff --git a/chapter01.tex b/chapter01.tex
index f921e08..c0fe4a8 100644
--- a/chapter01.tex
+++ b/chapter01.tex
@@ -331,7 +331,7 @@ long long x = 1;
 for (int i = 2; i <= n i++) {
     x = (x*i)%m;
 }
-cout << x << "\n";
+cout << x%m << "\n";
 \end{lstlisting}
 
 Usually the remainder should always