#include <bits/stdc++.h>
using namespace std;
struct edge {
  int u, v;
  long long w;
};
long long MOD = 1000000007;
long long _MOD = 1000000009;
double EPS = 1e-10;
int main() {
  long long n;
  cin >> n;
  cout << n / 2520 << endl;
}
