#include <bits/stdc++.h>
using namespace std;
int main() {
  int B[] = {1, 2, 4, 5, 10};
  int n;
  cin >> n;
  vector<int> F(n + 1, 0);
  for (int i = 1; i <= n; i++) F[i] = i;
  for (int i = 0; i < 5; i++) F[B[i]] = 1;
  for (int i = 3; i <= n; i++) {
    int m = F[i];
    for (int j = 0; j < 5; j++) {
      if (i < B[j]) continue;
      m = min(m, F[i - B[j]] + 1);
    }
    F[i] = m;
  }
  cout << F[n] << endl;
  return 0;
}