## https://yukicoder.me/problems/no/1869


def main():
    N, M = map(int, input().split())

    answer = 0
    for d in range(1, N + 1):
        answer += M

        if M % 2 == 0:
            M //= 2
        else:
            M = (M // 2) + 1
        if M == 1:
            answer += N - d
            break
    print(answer)


 
if __name__ == "__main__":
    main()