#include <iostream>
#include <algorithm>
#include <string>
#include <vector>
#include <map>
#include <set>
#include <stdio.h>
#include <cstring>
#include <queue>
#include <stack>
#include <functional>
#include <math.h>
#include <iomanip>
using namespace std;
#define Would
#define you

long long a, b, k[100005], mem[100005], ans;
int main() {
	cin >> a >> b;
	for (int i = 0; i < a; ++i) {
		cin >> k[i];
		++mem[k[i]];
	}
	for (int i = 0; i < a; ++i) {
		if (0 <= b - k[i] && b - k[i] <= 100000) { ans += mem[b - k[i]]; }
	}
	cout << ans << endl;
}