def calc(N, X, a):
    li = []
    for i in range(N):
        for j in range(i, N):
            n = a[i] + a[j]
            if n == X:
                li.append([a[i], a[j]])
                if i != j:
                    li.append([a[j], a[i]])
    ans = len(li)
    return ans

def main():
    N, X = map(int, input().split())
    a = list(map(int, input().split()))
    print(calc(N, X, a))

if __name__ == '__main__':
    main()