I am trying to complete a C-Sharp program yet having trouble

I would like help BUT WITHOUT using convert.int32 and instead just using: Strings, parse, int, dec or any other BASIC commands.... My needs are:

Ask the user to input a number:

• If the number is divisible by 2 then print out the next 3 numbers that are divisible by 2 in order.
• If the number is divisible by 3 then print out the next 3 numbers that are divisible by 3 in order.
• If the number is divisible by 5 then print out the next 3 numbers that are divisible by 5 in order.
• If the number is divisible by 7 then print out the next 3 numbers that are divisible by 7 in order.
• If the number is divisible by 8 then print out the next 3 numbers that are divisible by 8 in order.
• If the number is divisible by 13 then print out the next 3 numbers that are divisible by 13 in order.
• Otherwise end the program.