#include <bits/stdc++.h>
using namespace std;
const int MAX = 1e5 + 10;
const int MAXN = 1e4 + 10;
const int MOD = 1e9 + 7;
const int inf = 1e9;
const double pi = acos(-1.0);
const double eps = 1e-6;
int dx[] = {0, -1, 0, 1};
int dy[] = {1, 0, -1, 0};
long long n;
int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  cin >> n;
  cout << n / 2520;
  return 0;
}
