#include <iostream>
#include <map>
using namespace std;

long long a[200001];
map<long long, long long> m;

int main() {
    int n;
    long long c, ans = 0;
    cin >> n >> c;
    for (int i = 0; i < n; i++) {
        cin >> a[i];
        m[a[i]]++;
        a[i] -= c;
    }
    for (int i = 0; i < n; i++)
        ans += m[a[i]];
    cout << ans;
    return 0;
}