import  java.net.*;
 import  java.io.*;

 public   class  dl {
    /*
    arg[0] - url
    arg[1] - portion size
    arg[2] - filename to store
    */
     static   int  getSize(URL url)  throws  Exception {
        HttpURLConnection conn=(HttpURLConnection)url.openConnection();
        conn.setRequestMethod("HEAD");
        conn.getContent();
         int  sz=conn.getHeaderFieldInt("Content-Length",  0 );
        conn.disconnect();
         return  sz;
    }
     public   static   void  main(String[] arg)  throws  Exception {
        System.getProperties().put( "proxySet", "true" );
        System.getProperties().put( "proxyHost", "192.168.10.2" );
        System.getProperties().put( "proxyPort", "3128" );
         int  portionSize=Integer.parseInt(arg[ 1 ]);
        URL url= new  URL(arg[ 0 ]);
        FileOutputStream fos= new  FileOutputStream(arg[ 2 ]);
         int  current= 0 , next, fullSize=getSize(url);
        System.out.println("Downloading "+fullSize+" bytes");
         while (current<fullSize) {
            HttpURLConnection conn=(HttpURLConnection)url.openConnection();
            next=current+portionSize- 1 ;
             if (next>=fullSize)
                next=fullSize- 1 ;
            conn.setRequestProperty("Range", "bytes="+current+"-"+next);
             byte [] buf= new   byte [ 2048 ];
             int  nr;
            current+=portionSize;
            InputStream in=conn.getInputStream();
             while ( (nr=in.read(buf,  0 , buf.length))>= 0 ) {
                fos.write(buf,  0 , nr);
            }
            System.out.print(".");
            conn.disconnect();
        }
        fos.close();
        System.out.println("Done!");
    }
}