import java.util.*;
import java.io.*;

class Main{
    public static void main(String args[])throws IOException{
      try(BufferedReader br = new BufferedReader(new InputStreamReader(System.in))){
        int result = 0;

        String[] str = br.readLine().split(" ");

        for(int i=0; i < 3; i++){
          result = result + Integer.parseInt(str[i]);
        }

        if(result > 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