#include<stdio.h>

int main(){
	int n,x,i,j,count=0,k,a[100001]={0};
	scanf("%d%d",&n,&x);
	int b[n];
	for (i=0;i<n;i++) {
		scanf("%d",&k);
		b[i]=k;
		a[k]++;
	}
	for (i=0;i<n;i++) {
		k=x-b[i];
		count+=a[k];
	}
	printf("%d\n",count);
	return 0;
}