import java.io.*;
import java.util.*;
import java.util.regex.Pattern;
import java.util.regex.Matcher;
public class Solution {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int n = Integer.parseInt(scanner.nextLine());
        Pattern pattern = Pattern.compile("hackerrank",Pattern.CASE_INSENSITIVE);
        int count=0;
        for(int i=0;i<n;i++)
        {   Matcher matcher = pattern.matcher(scanner.nextLine());
            if (matcher.find()) count++;
        }
        System.out.println(count);
    }
}

import re
n = int(input())
counter = 0
for _ in range(n):
    tweet = input()
    if re.search(r"hackerrank", tweet, re.IGNORECASE):
        counter += 1
print(counter)

const lines = input.match(/^.*?\bhackerrank\b.*?$/gmi);
console.log(lines.length);

print(sum(1 if 'hackerrank' in input().lower() else 0 for _ in range(int(input()))))

n = int(input())

c = 0
for _ in range(n):
    tweet = input().lower()
    if 'hackerrank' in tweet:
        c += 1
print(c)