You have function one_two (oneTwo for Java) that returns 1 or 2 with 50% chance. one_two is already defined in a global scope and can be called everywhere.
Your goal is to create function one_two_three (oneTwoThree for Java) that returns 1, 2 or 3 with equal probability using only one_two function.
Do not try to cheat returning repeating non-random sequences. There is randomness test especially for this case.