#include <fstream>
#include <algorithm>
#include <cstdio>
#include <iostream>
#include <utility>
#include <string>
#include <bitset>
#include <set>
#include <utility>
#include <vector>
#include <utility>
#include <cstring>
#include <cstdlib>
#include <tr1/unordered_map>

#define mp make_pair
#define f first
#define s second
#define pb push_back
using namespace std;

int main()
{

    int n ;
    cin >> n;
    if( n == 1)
    {
        cout << 15 + 1;

    }
    else
        if( n == 2 )
        cout << 15 + 1;
    else
        if( n == 3 )
        cout << 15;
    else
        if( n == 4)
        cout << 15;
    else
        if( n % 2 ==1 && n % 4 == 1)
        cout << 15 + 1;
    else
        if( n % 2 == 0 && n % 4 == 2 )
        {
            cout << 15 + 1;
        }
    else
        if( n % 2 == 1 && n % 4 == 3)
        {
            cout << 15;
        }
    else
        if( n % 2 == 0 && n % 4 == 0 )
    {
        cout << 15;
    }

    return 0;

}