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


int main() {
           unsigned long long int n,m;
            cin>>n>>m;
    if(n>=m)
        {
            cout<<(n-1)+(n*(m-1));
    }
    else
        {
        cout<<(m-1)+(m*(n-1));
    }
    return 0;
}