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


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