#define rep(i,n) for (int i=0; i<(n); i++)
using namespace std;
using ll = long long;

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 << sum << endl;
}
