#include <iostream>


using namespace std;




int main(){
  long n; int i;
  long flairs=15;
  cin>> n;
  if(n==1)
    cout<<16;
  else{
  for(i=n; i>=1; i=i-4)
    flairs= flairs-n+(n-1)+(n-2)-(n-3);
  if(flairs>=15)
    cout<< flairs;
  else
    cout<<flairs+1;
  }
}