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


int main() {
    int n,m;
    cin>>n>>m;
    int count=0;
    int max=n>m?n:m;
    int min=n>m?m:n;
    count+=max-1;
    count+=max*(min-1);
    cout<<count;
    return 0;
}