import java.io.*;
import java.util.*;

public class Solution {
    public static long cut( long M, long N ){
        long a,b;
        if( M > N ){
            a = N;
            b = M;
        }else{
            a = M;
            b = N;
        }
        
        if( a == 0L ) return 0L;
        if( a == 1L ) return b-1L;
        
        //make even square
         if( (a&1) == 0 ){
            if( a == b ){
                //solve square
                return 3L+4L*cut(a/2L,a/2L);
            }
            
            //separate whats extra
            return 1L+cut(a,a)+cut(b-a,a);
        }else{
            //separate whats extra
            return 1L+cut(a-1L,b)+cut(1L,b);
        }
    }
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        long M = in.nextLong();
        long N = in.nextLong();
        
        System.out.println( cut(M,N) );
    }
}