#include<stdio.h>

int main(void){
  int r,c;

  for(;;){
    scanf("%d%d",&r,&c);
    if(r==0 && c==0)
      break;
    
    if(r%2 && c%2)
      printf("no\n");
    else
      printf("yes\n");
  }

  return 0;
}