import java.util.*;

public class Main{

    static long gcd(long a,long b){
        if(b==0)return a;
        return gcd(b,a%b);
    }

    static long lcm(long a,long b){
        return a/gcd(a,b)*b;
    }
    public static void main(String[] srgs){
        Scanner sc=new Scanner(System.in);

        int a=sc.nextInt();
        int b=sc.nextInt();
        int c=sc.nextInt();
        if(a+b+c>=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