import java.io.*;
import java.text.*;
//
//File Input and Output (I/O)
//
//

public class fileio1
{
	public static void Add(String filename) throws 
		IOException
	{
	//precondition: filename of integers is passed in
	//postcondition: values are summed and printed
		try 
		{
		  BufferedReader in= new BufferedReader(new
			FileReader(filename));
		  int sum=0,number=0; 

	         try
		 {
		  //add up all the numbers
		  while (true)
		  {
			number=Integer.parseInt(in.readLine());
			System.out.println(number);
			sum=sum+number;
		  }

	    	}
	 	catch (NumberFormatException e)
	 	{
		  System.out.println("End of file.");
		  System.out.println("The sum is: "+sum);
		  in.close();
		}

	 }
	catch (IOException e)
	{
		System.out.println("Error, file not found.");
	}

	}

	public static void main(String[] args) throws IOException
	{
		String filename;

		//create input stream to read from keyboard
		BufferedReader in=new BufferedReader
		   (new InputStreamReader(System.in));

		System.out.println("This program reads in numbers"+
			" from a file and adds them up.\n");

		System.out.println("Please enter the filename: ");
			filename=in.readLine();

		Add(filename);

		System.out.println("\nProgram Over, Bye!!!\n");
	}

}