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

int main()
{
    int n;
    cin >> n;
    ll sum = 0;
    for (int i = 1; i <= n; i++) {
        if (i%15 != 0 && i%3 != 0 && i%5 != 0) {
            sum += i;
            //cout << i << "\n";
        }
    }
    cout << sum << "\n";
}
