/**
 * 
 * Ashish Patel
 * e: ashishsushilPatel@gmail.com
 * w: https://ashish.me
 *
 */

class SimpleRecursion {
  static void fun(int n) {
    if (n == 0) {
      return;
    }
    System.out.println(n);
    fun(n-1);
    System.out.println(n);
  }

  public static void main(String[] args) {
    fun(3);
  }
}