#include <stdio.h>

int main(void)
{
    long n,x,a[100000],t[100001]={0},s=0,i;
    scanf("%ld%ld",&n,&x);
    for(i=0;i<n;i++){
        scanf("%ld",&a[i]);
        t[a[i]]++;
    }
    for(i=0;i<n;i++)if(x-a[i]>=0&&100000>=x-a[i])s+=t[x-a[i]];
    printf("%ld",s);
    return 0;
}