#include <bits/stdc++.h>
using namespace std::literals::string_literals;
using i64 = std::int_fast64_t;
using std::cout;
using std::endl;
using std::cin;

template<typename T>
std::vector<T> make_v(size_t a){return std::vector<T>(a);}

template<typename T,typename... Ts>
auto make_v(size_t a,Ts... ts){
  return std::vector<decltype(make_v<T>(ts...))>(a,make_v<T>(ts...));
}

int main() {
	std::string s; cin >> s;
	
	int ans = 0;
	std::string ns = "";
	for(int i = 0; i < (int)s.size(); i++) {
		if(i + 4 < s.size() and s.substr(i, 5) == "phnom") {
			ans++;
			ns += "penh";
			i += 4;
		} else {
			ns += s[i];
		}
	}
	s = ns;
	
	ns = "";
	for(int i = 0; i < s.size(); i++) {
		if(s[i] == 'h') continue;
		if(s[i] == 'e') ns += 'h';
		else ns += s[i];
	}
	ans += (s != ns);
	s = ns;
		
	ns = "";
	for(int i = 0; i < (int)s.size(); i++) {
		if(i + 4 < s.size() and s.substr(i, 5) == "phnom") {
			ans++;
			ns += "penh";
			i += 4;
		} else {
			ns += s[i];
		}
	}
	s = ns;
	
	ns = "";
	for(int i = 0; i < s.size(); i++) {
		if(s[i] == 'h') continue;
		if(s[i] == 'e') ns += 'h';
		else ns += s[i];
	}
	ans += (s != ns);
	s = ns;

	ns = "";
	for(int i = 0; i < (int)s.size(); i++) {
		if(i + 4 < s.size() and s.substr(i, 5) == "phnom") {
			ans++;
			ns += "penh";
			i += 4;
		} else {
			ns += s[i];
		}
	}
	s = ns;

	ns = "";
	for(int i = 0; i < s.size(); i++) {
		if(s[i] == 'h') continue;
		if(s[i] == 'e') ns += 'h';
		else ns += s[i];
	}
	ans += (s != ns);
	s = ns;
	
	ns = "";
	for(int i = 0; i < s.size(); i++) {
		if(s[i] == 'h') continue;
		if(s[i] == 'e') ns += 'h';
		else ns += s[i];
	}
	ans += (s != ns);
	s = ns;

	printf("%d\n", ans);
	return 0;
}