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

public class Solution {
public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner s = new Scanner(System.in);
		int n = s.nextInt();
		int m = s.nextInt();
		System.out.println(fun(n,m));
	}
	
	public static long fun(int m,int n){
		if(m == 1 && n == 1)
			return 0;
		if(n >= m){
			return 1 + fun(m,n/2) + fun(m,(n-n/2));
		} else{
			return 1+ fun(m/2,n) + fun((m-m/2),n);
		}
	}
}