import java.io.*;
public class Main{
  public static void main(String args[]) throws IOException{
    BufferedReader reader  = new BufferedReader (new InputStreamReader(System.in));
    String[] list = reader.readLine().split(" ");
    if(Integer.parseInt(list[0])+Integer.parseInt(list[1])+Integer.parseInt(list[2]) >=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