def calc(X, a):
    c = 0
    for i1 in a:
        for i2 in a:
            c += [0, 1][(i1 + i2) == X]
    return c


if __name__ == '__main__':
    N, X = map(int, input().split())
    a = list(map(int, input().split()))
    print(calc(X, a))