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

int main() {

    /* Enter your code here. Read input from STDIN. Print output to STDOUT */    
    int n,m,i,j,count;
    scanf("%d %d",&n,&m);
    
    if(n==1)
        count=m-1;
    else if(m==1)
        count=n-1;
        else
        count=m+n-2;
        printf("%d",count);
    return 0;
}