Console.WriteLine("What is your favourite number?")
Console.WriteLine("What is your second favourite number?")
Console.WriteLine("OK thank you. Would you like to add, subtract, mulitply or divide " & n1 & " and " & n2)
Console.WriteLine( n1+ n2)
Elseif op1 = "subtract" then
Console.WriteLine(n1 - n2)
Elseif op1 = "multiply" then
Console.WriteLine(n1 * n2)
Elseif op1 = "divide" then
Console.WriteLine(n1 / n2)
Console.Writeline("Invalid input")