import sys
input = sys.stdin.readline

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

if N<=100 and M>=2**(N-1):
    print(2**N-1)
    exit()

ANS=[M]
while len(ANS)<N:
    x=ANS[-1]

    if x%2==0:
        ANS.append(x//2)
    else:
        ANS.append((x+1)//2)

    if ANS[-1]==1:
        break

print(sum(ANS)+(N-len(ANS)))