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

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