from collections import defaultdict


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

    for num in A:
        counter_A[num] += 1

    patterns = 0
    for num in counter_A:
        if num > X - num:
            break

        if num == X - num:
            patterns += counter_A[num] ** 2
            break

        patterns += counter_A[num] * counter_A[X - num] * 2

    print(patterns)


if __name__ == "__main__":
    main()