#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 int row,col;
    cin>>row>>col;
    long int sum=0;
    if(row<col)
        {
        sum +=row-1;
        sum += (col-1)*row;
    }
    else 
        {
        sum += col-1;
        sum += (row-1)*col;
    }
    cout<<sum;
    return 0;
}