import java.io.*;


// sum all the integers in a file 

public class filetest4
{
   public static void main(String[] args) throws IOException
   {
     String fname;              // name of the input file
     String dataline;           // data value from file
     int sum = 0;               // sum of the values
     BufferedReader inputFile;  // file buffer

     // prompt and read the name of the file
     InputStreamReader stdin = new InputStreamReader(System.in);
     BufferedReader keyboard = new BufferedReader(stdin);
     System.out.print("Enter the name of a file to process: ");
     fname = keyboard.readLine(); 

     // open the data file
     try
     {
        FileReader freader = new FileReader(fname);
        inputFile = new BufferedReader(freader);
     }
     catch (IOException e)
     {
        System.out.println("Error: Unable to open file: " + fname);
        System.out.println("Can not recover from error.  Exiting.");
        return;
     } 

     // read until eof and sum the values
     dataline = inputFile.readLine();
     while (dataline != null)
     {
        sum += Integer.parseInt(dataline); 
        dataline = inputFile.readLine();
     }
     inputFile.close();

     // print the final sum
     System.out.println ("The sum = " + sum);
   }
}