#include <bits/stdc++.h>
using namespace std;
using namespace chrono;
#if __has_include(<atcoder/all>)
#include <atcoder/all>
using namespace atcoder;
#endif

int main() {
    int64_t n;
    cin >> n;

    int64_t ans = 0;

    for (int64_t a = 0; 5 * a <= n; a++) {
        for (int64_t b = 0; 5 * a + 2 * b <= n && b <= a; b++) {
            int64_t ck = n - 5 * a - 2 * b;
            if (ck % 3 == 0) {
                ans++;
            }
        }
    }

    cout << ans << endl;

    return 0;
}