import java.util.*;

public class Main {
    public static void main(String args[]) {
       ///値を取得
       Scanner sc = new Scanner(System.in);
       int a1 = sc.nextInt();
       int a2 = sc.nextInt();
       int a3 = sc.nextInt();
       int sum = a1 + a2 + a3;
       
       //出力
       if(sum >= 22) {
           System.out.print("bust");
       } else if(sum <= 21) {
           System.out.print("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