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


int main() {
    unsigned long int x, y,res;
    res = 1;
    cin>>x>>y;
    if(x > 1 && y > 1)
        {
        if(x > y)
            {
            res = y -1;
            res += y * (x -1);
        }
        else 
            {
            res = x -1;
            res += x * (y -1);
        }

    }

    if(x == 1) res = (y -1);
    if(y == 1) res = (x - 1);
    cout<<res;
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    return 0;
}