#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define rep(i, s, e) for (int i = (int)(s); i < (int)(e); ++i)

int main() {
	cin.tie(nullptr);
	ios_base::sync_with_stdio(false);
	
	ll N;
	cin >> N;
	
	ll num = 0;
	while (true) {
		if (N - num*500 < 100) {
			cout << num << '\n';
			break;
		}
		++num;
	}
}