import java.util.*;

public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    int a1 = sc.nextInt();
    int a2 = sc.nextInt();
    int a3 = sc.nextInt();
    
    if(a1 <= 13 && a1 >= 1  && a2 <= 13 && a2 >= 1 && a3 <= 13 && a3 >= 1){
      if(a1 + a2 + a3 >= 22){
      System.out.println("bust");
      }else {
      System.out.println("win");
      }
    }else{
      System.out.println("入力条件を満たしていません");
    }
  }
}
/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