#include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for(int i = 0; i < (int)(n); i++)
#define all(c) begin(c), end(c)
using ll = long long;

ll idiot(ll l, ll r){
    ll res = 0;
    for(ll i = l; i <= r; i++){
        if(i%3 == 0) res += 2;
        if(i%5 == 0) res += 2;
    }
    return res;
}

ll solve(ll n){
    return idiot(1,15) * (n/15) + idiot(n/15*15+1, n);
}

int main(){
    // for(int i = 1; i <= 100; i++){
    //     assert(solve(i) == idiot(1,i));
    // }
    ll n;
    while(cin >> n){
        cout << solve(n) << endl;
    }
}