# Enter your code here. Read input from STDIN. Print output to STDOUT
n,m = map(int,raw_input().split(' '))

v = {}

def recurse(m,n):
    if (m == 1) and (n==1):
        return 0
    else:
        if (m,n) in v:
            return v[(m,n)]
        
        if m>n:
            c = recurse(m/2,n) + recurse(m - m/2,n) + 1
        else:
            c = recurse(m,n/2) + recurse(m,n-n/2) + 1
        v[(m,n)] = c
        return c

print recurse(m,n)