#include <bits/stdc++.h>
using namespace std;


int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);
    const int MAX_A = 100000;
    int N, X;
    cin >> N >> X;
    vector<int> As(N, 0);
    vector<int> freq(MAX_A + 1, 0);
    for (int i = 0; i < N; ++i){
        cin >> As[i];
        ++freq[As[i]];
    }
    long long count = 0;
    for (auto a : As){
        int b = X - a;
        if (b >= 0 and b <= MAX_A){
            count += freq[b];
        }
    }
    cout << count << endl;
    return 0;
}