#include <iostream>
#include <string>
#include <numeric>

using namespace std;

int main()
{
	long int N, i, sum = 0;
	cin >> N;
	for (i = 1;i <= N;++i)
	{
		if (i % 15 == 0)
			continue;
		else if (i % 3 == 0)
			continue;
		else if (i % 5 == 0)
			continue;
		else
		{
			sum += i;
		}
	}
	cout << sum;
	return 0;
}