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

typedef long long ll;
#define MIN(x, y) (x < y ? x : y)
#define MAX(x, y) (x > y ? x : y)

using namespace std;

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

	int a[100000];
	for(int i = 0; i < N; ++i){
		cin >> a[i];
	}

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

	cout << count << endl;
}