#include<iostream>
#include<cstdio>
///nu uita sa comentezi freopen
using namespace std;
int n,a,b;
int main()
{
    int i;
//    freopen("mindcoding.in","r",stdin);
//    freopen("mindcoding.out","w",stdout);
    cin>>n;
    if (n%4==0 || n%4==3)
    {
        cout<<"15\n";
        return 0;
    }
    else
    {
        cout<<"16\n";
        return 0;
    }
    return 0;
}