import java.util.Scanner;

public class Main{
public static void main(String[] args){
Scanner scan=new Scanner(System.in);
int num=scan.nextInt();
 int numm=scan.nextInt();
  int nummm=scan.nextInt();
  
  if(num+numm+nummm>=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