#!/usr/bin/env python3
import sys

def main():
    N, X = map(int, input().split())
    if X > 2 * 10 ** 5:
        print(0)
        return
    A = list(map(int, input().split()))
    num = [0] * (10 ** 5 + 1)
    ans = 0
    for aa in A:
        num[aa] += 1
    for aa in A:
        if X - aa < 0:
            continue
        ans += num[X - aa]
    print(ans)
    return

if __name__ == '__main__':
    main()