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


int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
   long long int m,n;
    cin>>m>>n;
    if(m>=n)
        {
        cout<<((m-1)+m*(n-1));
    }
    else
        {
        cout<<((n-1)+n*(m-1));
    }
    return 0;
}