[Level 2] 124 나라의 숫자

class Solution {
    public String solution(int n) {
        String answer = "";
        
        while(n>0) {
            if(n%3==0) {
                answer = "4"+answer;
                n = n/3-1;
            } else {
                answer = String.valueOf(n%3)+answer;
                n /= 3;
            }
        }
        
        return answer;
    }
}