#include <bits/stdc++.h>
using namespace std;
using ll = long long;

int main(){
    ll n; cin >> n;

    ll ans = 0;

    for(ll i = 1; i <= n; i++) {
        if(i%15 == 0) continue;
        else if(i%3 == 0) continue;
        else if(i%5 == 0) continue;
        ans += i;
    }

    cout << ans << endl;

    return 0;
}