#include <iostream>
#include <vector>
#include <atcoder/convolution>

using ll = long long;

int main() {
    int N, X;
    std::cin >> N >> X;
    if (X >= 200000) {
        std::cout << 0 << std::endl;
        return 0;
    }
    std::vector<ll> fps(100001);
    while (N--) {
        int a;
        std::cin >> a;
        fps[a]++;
    }
    fps = atcoder::convolution_ll(fps, fps);
    std::cout << fps[X] << std::endl;
}