#include <iostream>
#include <vector>
#define ALL(variable) (variable).begin(), (variable).end()
#define GT(variableName, defaultValue, limit) for(int variableName = defaultValue; variableName < (int)limit; variableName++)
#define GTE(variableName, defaultValue, limit) for(int variableName = defaultValue; variableName <= (int)limit; variableName++)
#define LT(variableName, defaultValue, limit) for(int variableName = defaultValue; variableName > (int)limit; variableName--)
#define LTE(variableName, defaultValue, limit) for(int variableName = defaultValue; variableName >= (int)limit; variableName--)
#define YES cout << "Yes" << endl;
#define NO cout << "No" << endl;
using namespace std ;
int main(){
    long long N, X, answer;
    cin >> N >> X;
    answer = 0;
    vector<int> a(N);
    GT(i, 0, N){
        cin >> a[i];
    }
    sort(ALL(a));
    GT(i, 0, N){
        answer += upper_bound(ALL(a), X - a[i]) - lower_bound(ALL(a), X - a[i]);
    }
    cout << answer << endl;
}