import java.util.*;
public class Main
{
  public static void main(String args[])
  {
    Scanner in=new Scanner(System.in);
    int a1,a2,a3;
    a1=in.nextInt();
    a2=in.nextInt();
    a3=in.nextInt();
    if((a1+a2+a3)>=22)
    {
      System.out.println("bust");
    }
    else
    {
      System.out.println("win");
    }
  }
}

/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz