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

public class program8
{
	public static double Average(String filename,int max) throws 
		IOException
	{
	//precondition: filename of doubles is passed in, number
	//of doubles in the file is passed int
	//postcondition: average is returned
	  BufferedReader in= new BufferedReader(new
		FileReader(filename));
	  double sum=0,number=0; 
	  for(int count=1;count<=max;count++)
	  {
		number=Double.valueOf(in.readLine().trim()).doubleValue();
		sum=sum+number;
	  }
	in.close();
	return sum/max; 
	}

	public static void main(String[] args) throws IOException
	{
		String filename;
		int max=0;//number of values in file
		//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 averages them.\n");

		System.out.println("Please enter the filename: ");
			filename=in.readLine();
		System.out.println("Please enter the number of values: ");	
			max=Integer.parseInt(in.readLine());
		double ave=Average(filename,max);//function call
		System.out.println("Average is: "+ave);
		System.out.println("\nProgram Over, Bye!!!\n");
	}

}