#include <stdio.h>
#include <string.h>
#include <math.h>
#include <stdlib.h>

int main() {
    int n,m,e=0,d=0;
    scanf("%d %d",&n,&m);
    d=n-1+(n)*(m-1);
    e=m-1+(m)*(n-1);
    if(d<e)printf("%d",d);
    else printf("%d",e);

    /* Enter your code here. Read input from STDIN. Print output to STDOUT */    
    return 0;
}