#include<iostream>
#include<vector>
#include<stdlib.h>
#include<math.h>
using namespace std;

int main()
{
    int x, y;
    cin >> x >> y;
    if (x < 0 || y < 0 || x > 1000000 || y > 1000000)
    {
        return (0);
    }
    if (x == y)
    {
        cout << x + 1 << endl;
        return (0);
    }
    //if (x==1)
    //{
    //    cout << y + 1 << endl;
    //    return (0);

    //}
    //if (y == 1)
    //{
    //    cout << y + 1 << endl;
    //    return (0);
    //}
    if (x < y)
    {
        int temp = x;
        x = y;
        y = temp;
    }
    //fuction y=y0/x0*x
    double a = y + 1;
    double b = x + 1;
    double coe = a / b;
    int res = 0;
    double flag1 = 0;
    int flag = 0;
    for (int i = 0; i <= x + 1; i++)
    {
        double temp1 = 0;
        temp1 = coe*i;
        int temp2 = (int)temp1;
        if (fabs(temp1 - temp2) < 0.000001 || fabs(temp1 - temp2 - 1) < 0.000001)
        {
            flag = 1;
            flag1 = temp1;
            continue;
        }
        else
        {
            int temp3_top = int(temp1 + 1);
            int temp3_bottom = int(temp1);
            if (temp3_top > flag1 && temp3_top > temp1 )
            {
                if (flag == 1)
                {
                    flag1 = temp1;
                    res += 2;
                    flag = 0;
                    continue;
                }
                else if (temp3_bottom > flag1 && temp1 > temp3_bottom)
                {
                    flag1 = temp1;
                    res += 2;
                    flag = 0;
                    continue;
                }
                else
                {
                    res += 1;
                    flag1 = temp1;
                    continue;
                }
            }
            else
            { 
                flag1 = temp1;
                res += 2;
                continue;
            }
        }
    }
    cout << res << endl;
    return (0);
}