import java.util.Scanner;

public class Main {
	public static void main(String[] args) {

		Scanner scn = new Scanner(System.in);
		int a = scn.nextInt();
		int b = scn.nextInt();
		int c = scn.nextInt();

		int sum = a + b + c;

		if (sum >= 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