import java.io.BufferedInputStream;
import java.util.*;

public class Main {

    public static void main(String[] args) {
        //System.setIn(Main.class.getResourceAsStream("input"));
        Scanner sc = new Scanner(new BufferedInputStream(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");
    }

    private static int solve(String s, int n) {
        return n;
    }

    private static int nextInt(Scanner sc) {
        return Integer.valueOf(sc.nextLine());
    }
}
/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