#include <stdio.h>
#include <iostream>
#include <algorithm>
#define TEN5 100000
typedef long long ll;

ll a[100002];
int c[TEN5];

int main(){
        ll N,X;
        int cnt = 0;

        scanf("%lld",&N);
        scanf("%lld",&X);
        for(int i = 0; i <= TEN5 ; i++) c[i] = 0;
        for(int i = 0; i < N; i++){
                 scanf("%lld",a+i+1);
                 c[a[i+1]] += 1;
        }

        for(int i = 0; i <= X ; i++){
                cnt += c[i]*c[X-i];
        }
        printf("%d\n",cnt);
}