#define _USE_MATH_DEFINES
#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
#include<string>
#include<iostream>
#include<iostream>
#include<cctype>
#include<cstdio>
#include<vector>
#include<stack>
#include<queue>
#include <algorithm>
#include<math.h>
#include<set>
#include<map>
#include <sstream>
#include<iomanip>
#include <ctype.h>
using namespace std;

//#include<bits/stdc++.h>
long long int d[1000005];
int main() {
	
	long long int n, m;
	cin >> n >> m;

	for (int i = 0; i < n; i++) {

		int x;
		cin >> x;
		if(x<=1000000)d[x]++;

	}
	long long int b = 0;
	for (int i = 0; i <= 100000; i++) {
		if (i > m)break;
		if(d[i]&&m-i<=100000)b += d[m - i]*d[i];
//		cout << i << " " << b << endl;
	}
	cout << b << endl;



	return 0;
}