from collections import deque
n,k = map(int,input().split())
lis = deque()
lis.append(k)
cnt = 1
while(k > 1):
	if(k % 2 == 0):
		k //= 2
	else:
		k = k // 2 + 1
	lis.append(k)
	cnt += 1
if(n >= cnt):
	print(sum(lis) + n - cnt)
else:
	i = 0
	ans = 0
	while(i < n):
		ans += 2 ** i
		i += 1
	print(ans)