import java.util.Scanner;
import java.io.*; //refer6.3.2 and 6.4.1

class Ass1
{
 public static void main (String[] args) //this is the main method
  {
  int agecount = 0; // declare variable, agecount for counting the line and documents
    try{  // try is to open the file
    File fileopen = new File("ages.txt"); // just open the ages.txt[refer6.4.1]
    Scanner agefilescanner = new Scanner(fileopen); // to read or scan the file-ages.txt

    while (agefilescanner.hasNext())//this is the loop for counting the number of line[refer 6.4.1]
    {
    agecount = agecount + 1; //increment for the counter
    agefilescanner.next(); // goes to the next line
    }
    agefilescanner.close(); // to close the scanner
    } catch(FileNotFoundException e) //in case the file doe not exist
    {
    }
    System.out.println("age.txt contains " + agecount + " line");
    int buffer[] = new int[agecount]; //to declare the array, in this case use BUFFER

    try{
    File fileopen1 = new File("ages.txt");
    Scanner agefilescanner1 = new Scanner(fileopen1);

    int counter = 0; // declared int counter
    while (agefilescanner1.hasNextLine())  //loop for second files
    {
      buffer[counter] = agefilescanner1.nextInt();
      counter = counter+1; //increases the counter, to the sum
      }
      } catch (FileNotFoundException e) //in case the ages.txt doesnot exist, show an error
      {
      }
      int sum =0; //refer 5.3.3 Iterating over arrays with 'for' statements

      for (int i = 0; i < buffer.length; i++) //refer5.3.3]
    sum +=  buffer[i];
    System.out.println("The sum is = " + sum);//for the sum
    System.out.println("The mean is = " + sum/agecount);// this is for the calculation of mean

    for (int i = 0; i < buffer.length-1; i++)
    {
    for (int j = 1; j < buffer.length; j++)
    {
    if (buffer[i] == buffer[j])
    {
    System.out.println(buffer[i]);
    }
    }
    }


      int middle = buffer.length/2;
      int median = 0;
      if (buffer.length%2 == 1){
      median = buffer[middle];
      }
      else
      {
    median = buffer[middle-1] + buffer[middle] / 2;
      }
      System.out.println( "The median is = "+ median);





  }
}