Assignemnt #102 Keychains for sale part 2

Code

    ///Name: Morgan Kaplan
    ///Period: 5
    ///File Name: Keytwo.java
    
import java.util.Scanner;

public class Keytwo
{
	public static void main( String[] args )
	{
        int choice;
        int n=0,a,s,tn;
        
        do
        {
            Scanner momo = new Scanner(System.in);
        System.out.println("Keychain Shop!");
        System.out.println("1. Add Keychains to order");
        System.out.println("2. Remove Keychains from order");
        System.out.println("3. View current order");
        System.out.println("4. Checkout");
        System.out.println("5. Leave the page");
            choice=momo.nextInt();
            
            if (choice==1)
                n=Add(n);
            else if (choice==2)
                n=Remove(n);
            else if (choice==3)
                View(n);
            else if (choice==4)
                Checkout(n);
            else
                Bye();
        } while( choice!=5);
    }
    
    
    public static int Add(int n)
    {
    int a;
    Scanner momo = new Scanner(System.in);
    System.out.println( "How many Keychains would you like to add, you currently have " + n + "?");
    a=momo.nextInt();
    n=n+a;
    return n;
    }
       
    public static int Remove(int n)
    {
    int b;
    Scanner momo = new Scanner(System.in);
    System.out.println( "How many Keychains would you like to remove?");
    b=momo.nextInt();
    n=n-b;
    return n;       
    }
       
    public static void View(int n)
    {
    System.out.println(" You have " + n + " keychains");   
    }
       
    public static void Checkout(int n)
    {
        int p=10;
        int c= (p*n);
        System.out.println( "The total cost is " + c + ".");
    }
       
    public static void Bye()
    {
    System.out.println( "Bye, thank you for shopping!");
    }
}
    

Picture of Output