#!python
# -*- coding: utf-8 -*-


MAX = 10**5 + 10


def main():
    N, X = map(int, input().split())
    A = list(map(int, input().split()))

    b = [0 for i in range(MAX)]
    for i in range(N):
        b[A[i]] += 1

    ANS = 0
    for i in range(MAX):
        j = X - i
        if not 0 <= j <= MAX:
            break
        ANS += b[i] * b[j]

    print(ANS)


if __name__ == '__main__':
    main()