# https://yukicoder.me/problems/no/3254


def main():
    N, M = map(int, input().split())
    if N == 1:
        print(0)
        return

    array = []
    while M > 0:
        array.append(M % 2)
        M //= 2
    
    answer = 0
    for i in range(len(array)):
        a = 2 ** i
        if array[i] == 1:
            answer += 2 * (N // 2) * a
    if N % 2 == 1:
        for i in range(len(array)):
            a = 2 ** i
            if array[i] == 0:
                answer += 2 * a
    print(answer)
        






if __name__ == "__main__":
    main()