#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;

int l;
void calculate(long int x,long int y);

int main() {
    l=0;
    long int m,n;
    cin>>m>>n;
    calculate(m,n);
    cout<<l;
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    return 0;
}

void calculate(long int x,long int y)
    {
    if(x==1 && y==1)
        return;
    else 
        l++;
   
    if(x>y)
    {calculate(floor(x/2),y);calculate(x-floor(x/2),y);}
    else
        {
        calculate(x,floor(y/2));
        calculate(x,y-floor(y/2));
    }
    return;
}