#include <stdio.h>

/** Application main entry point. */
int main (
  int     argc,
  char  * argv[ ]
  )
{
  for ( ; ; )
  {
    int r, c;

    scanf ( "%d%d", &r, &c );
    if ( !( r | c ) ) break ;

    puts ( r % 2 && c % 2
         ? "no"
         : "yes" );
  }

  return ( 0 );
}