#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;
int n,m;


long long find(int a, int b)
{
    if(a == 1 && b == 1)
        return 0L;
    long long ans = 1;
    long long temp = 0;
    if(a > b)
    {
        temp += find(a/2,b);
        ans += 2*temp;
        if(a%2 != 0)
            ans += b;
    }
    else
    {
        temp += find(a,b/2);
        ans += 2*temp;
        if(b%2 != 0)
            ans += a;
    }
        
    return ans;
}
int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */ 
    cin>>n>>m;
    
    cout<<find(n,m)<<endl;
    return 0;
}