#include <bits/stdc++.h>

#define rep(i, n) for (int i = 0; i < (n); i++)

using namespace std;

int main() {
    int A[] = {-1, 7, 11, 13, 17, 19, 23, 29, 47, 59, 61};
    int n;
    cin >> n;
    cout << A[n] << endl;
    return 0;
}