#include"bits/stdc++.h"

using namespace std;

int main() {
	ios::sync_with_stdio(false);
	cin.tie(nullptr);
	int N;
	cin >> N;
	long long 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;

	return 0;
}