#include <bits/stdc++.h>

using namespace std;

const int MaxN = (int)1e6 + 10;
const int INF = 1e9;

int main() {
//	freopen("input.txt", "r", stdin);
//	freopen("output.txt", "w", stdout);
	int n;
	cin >> n;
	int cnt = 0;
	for (int i = 0; i < n; ++i) {
		string s;
		cin >> s;
		bool ok = false;
		for (int j = 0; j + 1 < (int)s.length(); ++j) {
			if (s[j] == 'c' && s[j + 1] == 'h' ||
				s[j] == 'h' && s[j + 1] == 'e' ||
				s[j] == 'e' && s[j + 1] == 'f') {
				ok = true;
			}
		}
		cnt += ok;
	}
	cout << cnt << '\n';
	return 0;
}