import java.util.stream.Stream;
import java.io.*;
import java.nio.*;
import java.nio.file.*;
class Teine{
  public static long failisuurus(Path tee){
	 try{
	  return Files.size(tee);	  
	 } catch(Exception ex){
		 ex.printStackTrace();
	 }
	 return -1;
  }
  public static void main(String[] arg) throws Exception{
     System.out.println(Files.list(Paths.get(".")).count());
     Files.list(Paths.get(".")).filter((f) -> f.toString().endsWith("java")).
	     forEach((f) -> System.out.println(f.getFileName()));
	 Files.list(Paths.get(".")).filter((f) -> f.toString().endsWith("java")).
	     forEach(f -> System.out.println(failisuurus(f)));
	 System.out.println(Files.list(Paths.get(".")).
	     filter((f) -> f.toString().endsWith("java")).
	     mapToLong((f) -> failisuurus(f)).sum());
  }
}