#include <bits/stdc++.h>

using namespace std;

int main() {
    int n, a, b, c, count = 0; //a:10的个数，b:20的个数，c:50的个数
    cin >> n; //n元钞票
    for (c = 0; c <= 2 * n / 100; c++)
        for (b = 0; b <= 5 * n / 100; b++) {
            if (c * 50 + b * 20 <= n)
                count++;
        }
    cout << count << endl;
    return 0;
}