#include <ctime>
#include <iostream>
using namespace std;

int main() {
    int N;
    cin >> N;
    if (N >= 8) {
        cout << 11 << endl;
    }
    else {
        int steps = 0;
        while (clock() < N * 100000) {
            steps += 1;
            if (steps % 10000000 == 0) {
                cerr << "!!!" << endl;
            }
        }
        cout << 3 + N << endl;
    }
    return 0;
}