Complete the code to declare variables with explicit types and print order information.

• Declare an int variable for order number and assign 1001;
• Declare an int variable for quantity and assign 3;
• Declare a long variable for price per item and assign 5000;
• Calculate the total order price by multiplying quantity by price per item, and store the result in a long variable;
• Use Console.WriteLine to print the order number, quantity, price per item, and total price, each on a separate line.

Example output:

Order number: 1001
Quantity: 3
Price per item: 5000
Total price: 15000