#include <iostream>

using namespace std;


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