#include<iostream>
#include <stdio.h>
#include <string.h>
#include <string>
#include <algorithm>

using namespace std;
int main()
{
	long long N, X;
	long long a[100001];
	long long b[200001] = {};
	long long Ans = 0;

	cin >> N >> X;
	for (int i = 0; i < N; i++) {
		cin >> a[i];
	}

	for (int j = 0; j < N; j++) {
		b[a[j]]++;
	}

	for (int k = 0; k < 200001; k++) {
		if (X - k >= 0 && X-k <=200001) {
			Ans = Ans + (b[k] * b[X - k]);
		}
		
	}

	cout << Ans;


	return 0;
}