#include <stdio.h>

int main() {

  int r,c;


  while(1) {
  scanf("%d %d",&r,&c);
  if(r == 0 && c== 0) break;

  if(r%2 == 1&&c %2 == 1)printf("no\n");
  else printf("yes\n");

 
  }

  return 0;

}