Another way is shown below, not perfect but the way you'd do it if you really did want to do integer arithmetic:
Code:
Lifter.lift1.set(Robot.oi.xBox.getRawAxis(1)*3/5);
Lifter.lift2.set(-Robot.oi.xBox.getRawAxis(1)*3/5);
This way multiplies by 3 and then divides by five. In integer arithmetic (especially division), the order of operations absolutely matters.