#include <stdio.h>

int main(void)
{
  int r, c;

  scanf("%d %d", &r, &c);

  while( !(r == 0 && c == 0) ) {
    if ( r*c % 2 == 0)
      printf("yes\n");
    else 
      printf("no\n");
    scanf("%d %d", &r, &c);

  }

  return 0;

}