#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 */   
    int n,m;
    int cuts=0;
    
    cin>>n>>m;
    if(n>m)
        {
        cout<<n-1 + n*(m-1);
    }
    
    if(n<=m)
        cout<<m-1 + n*(n-1);
    
    return 0;
}