#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
using ll = long long;
using vi = vector<int>;
using vvi = vector<vi>;
using vl = vector<ll>;
using vvl = vector<vl>;
using vs = vector<string>;
using vp = vector<pair<int, int>>;

#define rep(i, s, n) for (int i = s; i < (int)(n); i++)
#define sz(x) ((int)(x).size())
constexpr int INFI = 1001001001;
constexpr ll INFL = (1LL << 60);

int main (){
	ios::sync_with_stdio(false);
	cin.tie(nullptr);

	// input
	int n;
	cin >> n;
	
	int ans = 0;
	while(n > 100){
		n -= 500;
		ans ++;
		// cerr <<"n: "<< n << "\n" ;
	}
	cout << ans << endl;
	return 0;
}