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package com.javarush.task.task19.task1907;
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStreamReader;
/*
Считаем слово
*/
public class Solution {
public static void main(String[] args) throws IOException {
int count = 0;
BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
BufferedReader filereader = new BufferedReader(new FileReader(reader.readLine()));
reader.close();
while (filereader.ready()) {
if (filereader.readLine().matches("world ")) count++;
}
filereader.close();
System.out.println(count);
}
}