import java.util.Scanner;
public class Main{
	public static void main(String[] args) {
		Scanner sc =new Scanner(System.in);
		int a =sc.nextInt();
		int b =sc.nextInt();
		int c =sc.nextInt();
		int d=a+b+c;
		if(d>=22) {
			System.out.print("bust");
		}else {
			System.out.print("win");
		}
		sc.close();
	}
}

/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