#include<iostream>
#include<vector>

using namespace std;

int main() {
    long n, x;
    

    cin >> n;
    cin >> x;

    vector<long> a(n);

    for (int i = 0; i < n; i++){
        cin >> a[i];
    }
    
    long res = 0;

    for (int i = 0; i < n; i++){
        for (int j = 0; j < n; j++){
            if ((a[i] + a[j]) == x)
                res++;
        }
    }
    cout << res  << "\n";
}