#include <iostream>

int main()
{
	long N;
	bool useFlag = false;
	int num = 0;
	std::cin >> N;

	for (int i = 2; i * 2 <= N; i++)
	{
		if (N%i == 0)
		{
			if (num <= 0)
			{
				num++;
			}
			else
			{
				useFlag = true;
				break;
			}
		}
	}
	if (useFlag)
	{
		std::cout << "YES" << std::endl;
	}
	else
	{
		std::cout << "NO" << std::endl;
	}

	return 0;
}