#include <bits/stdc++.h>
using namespace std;
const int N = 2e5 + 10;
typedef long long ll;
ll n, c, ans = 0, q[N], a[N];
int main()
{
    cin >> n >> c;
    for (int i = 0; i < n; i++)
    {
        cin >> q[i];
        a[q[i]]++;
        q[i] -= c;
    }
    for (int i = 0; i < n; i++)
        ans += a[q[i]];
    cout << ans;
    return 0;
}