package com.javarush.task.task19.task1907;

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/*
Считаем слово
*/

public class Solution {
    public static void main(String[] args) throws IOException {
        BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(System.in));
        String fileName = bufferedReader.readLine();


        BufferedReader reader = new BufferedReader(new FileReader(fileName));
        int count = 0;
        String str = "";
        while (reader.ready()) {
            str += reader.readLine();
            }

        Pattern pattern = Pattern.compile("\\bworld\\b", Pattern.CASE_INSENSITIVE);
        Matcher matcher = pattern.matcher(str);

        while (matcher.find())
            count++;


        System.out.println(count);
        reader.close();
        bufferedReader.close();

    }
}