java简单实现

import java.util.*;

public class Main {
    private static final Scanner scanner = new Scanner(System.in);

    public static void main(String[] args) {
        var x = scanner.nextInt();
        if(x < 1)
            System.out.println(x);
        else if(x < 10)
            System.out.println(x * 2 - 1);
        else
            System.out.println(x * 3 - 11);
    }
}