import java.io.*;
import java.util.*;
class Counter
{
 public static void main(String[] args) throws NullPointerException
  {
  System.out.println("Enter the number of words to find its frequency:");
  Scanner scan = new Scanner(System.in);
  int k=scan.nextInt();//Number of top words to be found is stored here
  Scanner scan1 = new Scanner(System.in);
  System.out.println("Enter the file path to analyse the words:");
  String path=scan1.nextLine();// Directory path will be stored here
  File folder = new File(path);
  File[] listOfFiles = folder.listFiles();//To get the list of file-names present in the path 
  BufferedReader br = null;
  String words[]=null;
  String line="";
  String files;
  String word;
  int count=0;
 // List<String> list = new ArrayList<String>();
    for(File f:listOfFiles) {
        if (f.isFile()) {
   		files = f.getName();
                if (files.endsWith(".txt") || files.endsWith(".TXT")) {
                         try{
			 br=new BufferedReader(new FileReader(f));
			       try{
                                  while((line=br.readLine())!=null){ 
                                        line = line.toLowerCase(); // convert to lower case 
                                         words = line.split("\\s+");
                                                                }
                                       java.util.Arrays.sort(words);


                                   for(int i=0;i<words.length;i++) {
                                                 word = words[i];
                                   for(int j=0;j<words.length;j++) {
                                      if(words[j+1].equals(word)){
                                                    count++;
                                                  }
                                           
                                                          }
                                              }
                                      System.out.println(count);



                                             
                                     }
                                      catch(IOException e){
                                           System.out.println("I am sorry:"+e);
                                                           }
                                                                           }
                           catch(FileNotFoundException e){
                             System.out.println("Here i have got"+e.getMessage());
                                                          }

                                     }
                       }
                  }
          }
    }