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#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;
