Type a number, Then type a wait time. Then sit and watch. If your number is equal to 1 by the end, you fail. I wouldn't recommend setting the wait time to be super slow, then you have to wait ages. This is meant to be a program that allows you to visualize the 3x+1 problem, where you take a number, and if its odd, multiply by 3 and add 1, if its even, divide by 2. If your number is equal to 1, which is odd, it will become 4, which becomes 2, which becomes 1, which is a loop. So that's why it automatically stops when it equals 1.