diff --git a/main.cpp b/main.cpp
index 13bedea..84cff7e 100644
--- a/main.cpp
+++ b/main.cpp
@@ -1,4 +1,5 @@
 #include <iostream>
+#include <algorithm.h>
 
 using namespace std;
 
@@ -11,6 +12,7 @@ int main()
         << "A - B = " << a - b << '\n'
         << "A * B = " << a * b << '\n'
         << "A / B = " << a / b << '\n';
+    max(a, b);
 
     return 0;
 }