import java.util.*;
class Solution {
public static List<Integer> solution(int n) {
List<Integer> answer = new ArrayList<>();
answer.add(n);
while(n != 1){
if(n % 2 == 0){
n = n/2;
}else{
n = 3*n + 1;
}
answer.add(n);
}
System.out.println(answer);
return answer;
}
}