#include<iostream>
#include<vector>
#include<algorithm>
using namespace std;
using ll = long long;

int main(void){
  int n; cin >> n;
  if(n<500){
    cout << 0 << endl; return 0;
  }
  n-=100;
  cout << (n+500-1)/500 << endl;
  return 0;
}