124 나라의 숫자

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class Solution {
    public String solution(int n) {
        StringBuilder sb = new StringBuilder();
        int temp = 0;
        
        while (n > 0){
            temp = n % 3;
            n /= 3;

            if (temp == 0){
                n -= 1;
                sb.insert(0, "4");
            }
            else {
                sb.insert(0, temp);
            }
        }
        
        return sb.toString();
    }
}