JAVA 代码

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        solve(n);
    }

    public static void solve(int n) {
        int sum = 0;
        int t = 1;
        int cnt = 0;
        while (sum < n) {
            sum += t;
            t *= 3;
            cnt++;
        }
        System.out.println(cnt);
    }
}