#include <iostream>
#include <vector>
#include <map>
using namespace std;
template<class T> bool maxPointer(T& a, T b) { if (a < b) {a = b;return true;}return false;}
template<class T> int maxReturn(T a, T b) {if (a > b) {return a;} else {return b;}}
template<class T> bool minPointer(T& a, T b) {if (a < b) {a = b;return true;}return false;}

int main(void){
    int N;
    long X;
    cin >> N >> X;
    int a[N];
    int count = 0;
    
    for (int i = 0; i < N; i++) {
        cin >> a[i];
    }
    
    for (int i = 0; i < N; i++) {
        for(int j = 0; j < N; j++) {
            //if (i == j) continue;
            
            if (a[i] + a[j] == X) ++count;
        }
    }
    
    cout << count << endl;
}