def main():
    import sys
    from collections import Counter
    input = sys.stdin.readline

    N, x = map(int, input().split())
    A = list(map(int, input().split()))

    C = Counter(A)
    ans = 0
    for i in range(10**5+1):
        if i in C and x-i in C:
            ans += C[i] * C[x-i]
    print(ans)


if __name__ == '__main__':
    main()