import java.util.*;
import java.io.*;
import java.lang.*;
public class Main{
public static void main(String[] args) throws FileNotFoundException, IOException{
       Scanner s=new Scanner(System.in);
      int n=s.nextInt(),n1=s.nextInt(),n2=s.nextInt();
      if(n+n1+n2>=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