import java.util.Scanner;

public class Main {
	public static void main(String args[]){
        Scanner sc = new Scanner(System.in);
        int A1 = sc.nextInt();
        int A2 = sc.nextInt();
        int A3 = sc.nextInt();
        sc.close();
        
        if(A1 + A2 + A3 >= 22) {
        	System.out.println("bust");
        }
        else if(A1 + A2 + A3 <= 21) {
        	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