Help me in solving SYN6V2 problem

My issue

how to make logic of equation to find Perimeter of the rectangle?

My code

#include <bits/stdc++.h>
using namespace std;

int main() {

  cout << 11 * 13 <<endl; //Replace the _ with correct digits
  cout << 2 * ( 11 + 13 );

  return 0;
}

Learning course: Learn C++
Problem Link: CodeChef: Practical coding for everyone

@jayambe7
The formula to find the parameter of the rectangle is 2*(l+b).