[프로그래머스] 124나라의 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 = n%3 + answer;
              n /= 3;
          }
      }
      return answer;
  }
}