#include <iostream>
#include <string>
#include <vector>
#define llint long long
#define mod 1000000007

using namespace std;

string s;

llint calc(string &s)
{
	llint ret = 0;
	for(int i = 0; i < s.size(); i++){
		if(s[i] == 'e') ret = 2;
		if(s[i] == 'h') ret = 1;
	}

	llint mx = 0, sum = 0, phn = 0, penh = 0;
	for(int i = 0; i < s.size(); i++){
		if(i+2 < s.size() && s.substr(i, 3) == "phn"){
			i += 3;
			llint cnt = 0; bool flag = false;
			for(; i < s.size();){
				if(!flag && s[i] == 'o') flag = true, i++;
				else if(flag && s[i] == 'm') flag = false, i++, cnt++;
				else if(s[i] == 'e' && cnt >= 2) i++;
				else if(s[i] == 'h' && cnt >= 1) i++;
				else break;
			}
			if(cnt >= 1){
				mx = max(mx, cnt);
				sum += cnt;
			}
			i--;
		}
		if(i+3 < s.size() && s.substr(i, 4) == "penh"){
			i += 4;
			llint cnt = 1; bool flag = false;
			for(; i < s.size();){
				if(!flag && s[i] == 'o') flag = true, i++;
				else if(flag && s[i] == 'm') flag = false, i++, cnt++;
				else if(s[i] == 'e' && cnt >= 2) i++;
				else if(s[i] == 'h' && cnt >= 1) i++;
				else break;
			}
			mx = max(mx, cnt);
			sum += cnt;
			penh++;
			i--;
		}
	}
	if(mx >= 1){
		llint tmp = sum + mx + 1 - penh;
		ret = max(ret, tmp);
	}

	return ret;
}

bool ope(string &s)
{
	string t = s;
	s = "";

	bool flag = false;
	for(int i = 0; i < t.size(); i++){
		if(t[i] == 'h'){
			flag = true;
		}
		else if(t[i] == 'e'){
			s += 'h';
			flag = true;
		}
		else s += t[i];
	}
	return flag;
}

int main(void)
{
  ios::sync_with_stdio(0);
  cin.tie(0);

  cin >> s;
	llint ans = calc(s);
	if(ope(s)) ans = max(ans, calc(s)+1);
	if(ope(s)) ans = max(ans, calc(s)+2);
	cout << ans << endl;

  return 0;
}