# Enter your code here. Read input from STDIN. Print output to STDOUT n, m =[int(x) for x in raw_input().split(' ')] cut = 0 if n%2 !=0 and n!=1: cut+=1 n-=1 if m%2 !=0 and m!=1: cut+=1 m-=1 while m>1 and n>1: n = n/2 m = m/2 cut+=2 if n>1: print(cut+n-1) else: print (cut+m-1)