#include<iostream>

using namespace std;

int main() {

	int n, x;
	int *array;
	
	cin >> n >> x;
	array = new int[n];
	for (int i = 0;i < n;i++) {
		cin >> array[i];
	}
	int count = 0;
	for (int i = 0;i < n;i++) {
		for (int j = 0;j < n;j++) {
			if (array[i] + array[j] == x)count++;
		}
	}

	cout << count;

	delete[] array;

	return 0;
}