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

int main() {
  int n;
  cin >> n;
  ll ans = 0;
  for (int i = 1; i <= n; i++) {
    if (i % 15 == 0) continue;
    else if (i % 5 == 0) continue;
    else if (i % 3 == 0) continue;
    else ans += i;
  }
  cout << ans << endl;
}