input number in range

Hello
With the inputbox I want to insert a numeric value
to define a cell range, for example "C15:F15"

This is the code i´m using:

x = InputBox("Insert Row")
Range("C(x):F(x)").Select


Where (x) represents the Inputbox data (the number "15") I want to insert, But it doesn´t runs, anybody can help me?

Regards
Claudio