Help me in solving RCPITCP04 problem

[rcp_fy_24130]

My issue

Write program error

My code

#include <stdio.h>

int main()
{

    printf("20");
}

return 0;
}

Learning course: Learn C Programming
Problem Link: https://www.codechef.com/learn/course/rcpit-programming-c/RCPITLPC01/problems/RCPITCP04