from collections import Counter


def main():
    n, x = map(int, input().split())
    arr = list(map(int, input().split()))
    c = Counter(arr)

    ans = 0
    for a in arr:
        if a == x - a:
            ans += c[a]
        else:
            ans += c[x - a]
    print(ans)


if __name__ == "__main__":
    main()