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public class Solution {
    public int solution(int num) {
        int answer = 0;

        for(int i = 0; i < 500; ++i)
        {
            if (num == 1)
            {
                return i;
            }

            if (num % 2 == 0)
            {
                num /= 2;
            }
            else
            {
                num = num * 3 + 1;
            }
        }

        return -1;
    }
}