#include <iostream>

int main()
{
	int N, X;
	std::cin >> N >> X;

	int *in = new int[N];
	for(int i = 0; i < N; i++)
		std::cin >> in[i];

	int ans = 0;
	for (int i = 0; i < N; i++)
	{
		for (int j = 0; j < N; j++)
		{
			if (in[i] + in[j] == X)
				ans++;
		}
	}

	std::cout << ans << std::endl;


	delete[] in;
	return 0;
}