#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;
int main() {
    long long int a,b;
    cin>>a>>b;
    long long int max,min;
    if (a>b)
        {
        max=a;
        min=b;
    }
    else
        {
        max=b;
        min=a;
    }
    long long int c;
    c=((min-1)+min*(max-1));
    cout<<c;
    return 0;
}