소스 코드 제출

# a=0

# def f(n):

# global a

# a=a+1

# if n==1:

# return

# if n%2==0:

# n=n//2

# elif n%2==1:

# n=3*n+1

# f(n)

# n=int(input())

# f(n)

# print(a)

a,b=map(int,input().split())

def f(a,b):

if a>=b:

a=a//2

f(a,b)

if a<=b:

if b//2:

b=b//2

f(a,b)

f(a//2,b//2)

print(f(a,b))