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

int main() {
    long int n,m,ans;
    scanf("%ld %ld",&n,&m);
    if(n>m)
        ans=(n-1)+(m-1)*n;
    else
        ans=(m-1)+(n-1)*m;
    printf("%ld",ans);
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */    
    return 0;
}