N, M = map(int, input().split())

if M == 1:
    print(N)
else:
    t = (M - 1).bit_length()
    s = bin(M - 1).count('1')
    sum_first = 2 * (M - 1) - s + t
    sum_second = max(0, N - t)
    print(sum_first + sum_second)