import java.util.Scanner; // 注意类名必须为 Main, 不要有任何 package xxx 信息 public class Main { public static void main(String[] args) { Scanner in = new Scanner(System.in); int n = in.nextInt(); if (n == 1) { System.out.println(0); } else if (n == 2 || n == 3) { System.out.println(1); } else { int []arr = new ...
