import java.io.*;
import java.util.*;

class Average13 {
// A program to calculate the average of a series of integers
// read from a file (may have several integers per line).

 public static void main(String[] args) throws IOException {
  int sum=0,count=0;
  String filename="";
  BufferedReader file,in =  new BufferedReader(new InputStreamReader(System.in));
  for(;;) try {
      System.out.print("Enter file name: ");
      filename=in.readLine();
      file = new BufferedReader(new FileReader(filename));
      break;
  }
  catch(FileNotFoundException e) { System.out.println("File "+filename+" not found"); }
  try {
       for(;;) {
           StringTokenizer tokens = new StringTokenizer(file.readLine());
           for(; tokens.hasMoreTokens(); count++)
             sum+=Integer.parseInt(tokens.nextToken());
       }
  }
  catch(NumberFormatException e) {
       System.out.println("File contains non-numerical data");
  }
  catch(Exception e) { System.out.println("Average is "+sum/count); }
 }

}