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

ll c[TEN5+1];

int main(){
        ll N,X,a;
        ll 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);
                 c[a] += 1;
        }

        for(int i = 0; i <= TEN5 ; i++){
                if(0 <= X-i && X-i <= TEN5) cnt += c[i]*c[X-i];
        }
        printf("%lld\n",cnt);
}