#include <stdio.h>

int main(void)
{
  int a,b; 
  int skok = 0;
  
  while(a != 0 && b != 0)
    {    
      scanf("%d %d\n", &a, &b);
      if ((a + 1) <= (2 * (a + b) - 4))
        {    
          printf("Yes, village can be built\n");
        }  
      else printf("No, village cannot be built\n");
      for (skok = 1; skok <= b; skok++)
        scanf("\n");	
    }	
  return 0;	
}