出这种题的意义是啥，还放在最后面100

import java.util.Scanner;

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

        int count = 0; 
        for (int i = 0, k = 2; i < n; i++, k += 3) {
            count += k;
        }
        System.out.println(count);
    }
}