import java.util.*;
class Main{
  public static void main(String[] s){
    Scanner sc = new Scanner(System.in);
    int a =sc.nextInt()+sc.nextInt()+sc.nextInt();
    if(a>21){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