from collections import defaultdict
import sys


def input(): return sys.stdin.readline().rstrip('\n')


def main():
    n, x = map(int, input().split())
    *a, = map(int, input().split())
    d = defaultdict(int)
    ans = 0
    for i in a:
        ans += 2 * d[x-i]
        if 2*i == x:
            ans += 1
        d[i] += 1
    print(ans)


if __name__ == '__main__':
    main()