if statement not working the way I want to?

So I have this question homework that I'm stuck on,

"Online Book Merchants offers premium customers 1 free book with every purchase of 5 or more books and offers 2 free books with every purchase of 8 or more books. It offers regular customers 1 free book with every purchase of 7 or more books, and offers 2 free books with every purchase of 12 or more books. Create a java program that demonstrates this store" I was told I need to use the nested if, so my code looks like this now:

Scanner input = new Scanner (System.in);
System.out.println("Hello user, enter your status customer (Regular/Premium).");
String status = input.next();
        
if ("premium".equalsIgnoreCase(status)) {
    System.out.println("Enter amount of books purchased");
    int preBooks = input.nextInt();
    if (preBooks >=5) {
        System.out.println("Congratulations Premium user, you have earned 1 free book.");
    }
    else if (preBooks >=8) {
        System.out.println("Congratulations Premium user, you have earned 2 free books.");
    }
}
else if ("Regular".equalsIgnoreCase(status)) {
    System.out.println("Enter amount of books purchased user.");
    int regBooks = input.nextInt();
    if (regBooks >=7) {
        System.out.println("Congratulations Regular user, you have earned 1 free book.");
    }
    else if (regBooks >=12) {
        System.out.println("Congratulations Regular user, you have earned 2 free books.");
    }
}   
else {
    System.out.println("Wrong input.");
}

And so far at least to the output, it is correct my only issue is when I type premium then lets say 8, it would still give me only 1 books (which is for the 5)

and likewise situation for Regular

I do not know what to do or what is wrong with my code so if anyone could help I would really appreciate it :/