#include <bits/stdc++.h>
using namespace std;
int main() {
int n,k;
scanf("%d %d",&n, &k);
int a[n];
for(int i=0;i<n;i++){
scanf("%d", &a[i]);
}
int c=0;
sort(a,a+n);
for(int i=0;i<n;i++){
for(int j =i+1;j<n;j++){
if(a[j]-a[i] == k){
c++;
}
if(a[j]-a[i] > k){
break;
}
}
}
printf("%d\n",c);
return 0;
}
I2luY2x1ZGUgPGJpdHMvc3RkYysrLmg+CnVzaW5nIG5hbWVzcGFjZSBzdGQ7CgppbnQgbWFpbigpIHsKCQlpbnQgbixrOwoJCXNjYW5mKCIlZCAlZCIsJm4sICZrKTsKCQlpbnQgYVtuXTsKCQkKCQlmb3IoaW50IGk9MDtpPG47aSsrKXsKCQkJc2NhbmYoIiVkIiwgJmFbaV0pOwoJCX0KCQkKCQlpbnQgYz0wOwoJCXNvcnQoYSxhK24pOwoJCWZvcihpbnQgaT0wO2k8bjtpKyspewoJCQlmb3IoaW50IGogPWkrMTtqPG47aisrKXsKCQkJCWlmKGFbal0tYVtpXSA9PSBrKXsKCQkJCQljKys7CgkJCQl9CgkJCQlpZihhW2pdLWFbaV0gPiBrKXsKCQkJCQlicmVhazsKCQkJCX0KCQkJfQoJCX0KCQkKCQlwcmludGYoIiVkXG4iLGMpOwoJCQoJcmV0dXJuIDA7Cn0=