#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 n,m;
    cin>>n>>m;
    long long int m1=n>m?n:m;
    long long int m2=n>m?m:n;
    long long int cuts=m1-1+(m2-1)*m1;
    cout<<cuts;
    
    return 0;
}