#include <iostream>
#include <algorithm>
#include <vector>
#include <fstream>
#define DN 1000005

using namespace std;

int res[DN];

int main() {
    int n;
    //freopen("input.txt","r",stdin);
    cin >> n;
    if(n % 4 == 1 || n % 4 == 2){
        cout << 16;
        return 0;
    }
    cout << 15;
    return 0;
}