import sys
input = lambda: sys.stdin.readline().rstrip()
mi = lambda: map(int,input().split())
li = lambda: list(mi())

n,k = mi()

def solve(l, r):
	global n
	if l==r:
		return l
	elif r==n:
		return solve(l,r-1)
	else:
		if (r-l+1)%2 == 1:
			return solve(l+(r-l+1)//2+1,r)
		else:
			return solve(l+(r-l+1)//2,r)

if n==1:
	print(1)
else:
	print(solve(k+1,n) if k<n else solve(1,k-1))