#include <bits/stdc++.h>

using namespace std;

int N = 3;
vector<int> V = { 1, 3, 4 };


int LeiaKogus(int S) {
    if (S < 0) return INT16_MAX;
    if (S == 0) return 0;
    else {
        int vastus = INT16_MAX;
        for (int i = 0; i < N; i++) {
            vastus = min(vastus, 1 + LeiaKogus(S - V[i]));
        }
        return vastus;
    }
}

int main()
{
    int S;
    cin >> S;
    cout << LeiaKogus(S) << endl;
    return 0;
}