how to get mouse hweel input in unity code example

Example 1: unity mouse wheel

Input.mouseScrollDelta.y //Return 1 when up and -1 when down and 0 when the mouse scroll is not rotated

Example 2: unity on mousewheel down

if (Input.GetAxis("Mouse ScrollWheel") > 0f) // forward
 {

 }
if (Input.GetAxis("Mouse ScrollWheel") < 0f) // backwards
{
               
}