/* -*- coding: utf-8 -*-
 *
 * 3295.cc:  No.3295 Buying Bottled Water - yukicoder
 */

#include<cstdio>
#include<algorithm>

using namespace std;

/* main */

int main() {
  int n;
  scanf("%d", &n);

  int c = (n - 99 + 499) / 500;
  printf("%d\n", c);
  
  return 0;
}