#include <bits/stdc++.h>
using namespace std;

using ll = long long;
using vll = vector<long long>;
#define rep(i, n) for (ll i = 0; i < ll(n); i++)

ll MOD = 998244353;

int main() {
  ll n;
  cin >> n;
  cout << (n + 499) / 500 << "\n";
}