i have a value from -1 to 1 but i need to make it from 0 to 1

i am using a joystick to lerp a value from a joint , the lepr function requires a value from 0 to 1 and to joystivk is from -1 to 1 , what would be the simplest way to use the joystick output as a 0 to 1 value?

Mathf.Lerp (pointA, pointB, (joystickInput+1)*.5);