Karkit

input/code.cpp:2:10: fatal error: math: No such file or directory
 #include <math>
          ^~~~~~
compilation terminated.

#include <iostream>
#include <math>

using namespace std;

int main()
{
	char a, b, c;
	cin>>c>>a>>b;
	cout<<c % max(a,b);
	return 0;
}