/*
  AOJ 1072
  Title:
  @kankichi573
*/
#include <stdio.h>
int r,c;
main()
{
  while(scanf("%d %d",&r,&c) && (r||c))
    {
      if((r & 1) && (c & 1))
	printf("no\n");
      else
	printf("yes\n");
    }
  return(0);
}