#include <cstdio>
#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
using namespace std;

#define all(x) (x).begin(),(x).end()
#define pb push_back

void ans(int n)
{
    int a[11]={0,7,0,9,4,5,6,0,0,0,0};

    int ans = a[n];
    if(ans == 0) ans=13;

    cout << ans << endl;
}

int main()
{
    int n;
    cin >>n;
    ans(n);
}