#include <bits/stdc++.h>

using namespace std;

int main() {
    int N;
    cin >> N;

    int sum = 0;

    //努力尝试5瓶，不行再尝试3瓶,一瓶10元
    while (N >= 5 * 10) {
        N -= 50;
        sum += 7;
    }

    while (N >= 3 * 10) {
        N -= 30;
        sum += 4;
    }

    while (N >= 10) {
        N -= 10;
        sum++;
    }
    cout << sum << endl;
    return 0;
}