class RecursionOne
{

    public static
    void main ( String [] args )
    {
       int i = 5 ;
       f(i) ;
    }

    static 
    void f ( int i ) 
    {
       System.out.println(i) ;
       if ( i>0 ) f(i-1) ;
       System.out.println(i) ;
    } 

}