#include <bits/stdc++.h>
using namespace std;



void main_() {
	int n;
	cin >> n;
	string s;
	cin >> s;

	int ans = 0;
	string suf = "HAPPY";

	for(int i = 0; i < 5; i++){
		if(s[n-5+i] != suf[i])ans++;
	}

	for(int i = 0; i + 5 < n;i += 5){
		bool ex = true;
		for(int j = 0; j < 5; j++){
			if(s[i+j] != suf[j])ex = false;
		}
		if(ex)ans++;
	}
	cout << ans << endl;

};

 
int main() {
	int t = 1;
	// cin >> t;
	while(t--) main_();
	return 0;
}