#include <bits/stdc++.h> 

using namespace std;

typedef long long ll;

int main(void){
    ll n;
    cin >> n;
    ll ans = 0;
    for(ll i = 1; i < n+1; i++){
        if(i % 3 != 0 && i % 5 != 0) ans += 1;
    }
    cout << ans << endl;
}