import java.util.*;

class Main {
    public static void main(String[] args) {
        
        Scanner sc = new Scanner(System.in);
        
        //入力値を設定する
        Integer firstNum = sc.nextInt();
        Integer secondNum = sc.nextInt();
        Integer thirdNum = sc.nextInt();
        
        if(firstNum + secondNum + thirdNum <= 21) {
            System.out.println("win");
        } else {
            System.out.println("bust");
        }

    }    
}

/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