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

int main() {

    long int m,n,p1,p2;
    scanf("%ld %ld",&m,&n);
    p1=(m-1)+(n-1)*m;
        p2=(n-1)+(m-1)*n;
    if(p1<p2)
        printf("%ld",p1);
    else printf("%ld",p2);
}