#include <bits/stdc++.h>

using namespace std;

int main() {
    int n, 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++)
        //count += 5 * (n - c * 50) / 100 + 1;
        count += (n - c * 50) / 20 + 1;
    cout << count << endl;
    return 0;
}