#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using ld = long double;
using P = pair<ll, ll>;
using Vec = vector<ll>;
template <typename T>
using Vec1 = vector<T>;
template <typename T>
using Vec2 = vector<Vec1<T> >;
#define all(s) (s).begin(), (s).end()
#define pb push_back
#define mp make_pair
#define fs first
#define sc second
template <typename T>
bool chmax(T &a, const T b){if(a < b){a = b; return true;} return false;}
template <typename T>
bool chmin(T &a, const T b){if(a > b){a = b; return true;} return false;}
template <typename T>
ll pow2(const T n){return (1LL << n);}
void sonic(){ios::sync_with_stdio(false); cin.tie(0); cout.tie(0);}
void setp(const ll n){cout << fixed << setprecision(n);}
const ll INF = 1e9+1;
const ll LINF = 1e18+1;
const ll MOD = 1e9+7;
//const ll MOD = 998244353;
const ld PI = acos(-1);
const ld EPS = 1e-11;

int main(void){
	string s;
	cin >> s;
	string ph = "phnom";
	ll cnt = 0;
	bool flg;
	while(true){
		flg = false;
		for(ll i = (ll)s.size()-4; i >= 0; --i){
			if(s.substr(i, 5) == ph){
				string u = s.substr(0, i)+"penh"+s.substr(i+5, s.size()-i-5);
				s = u;
				cnt++;
				flg = true;
			}
		}
		if(flg) continue;

		flg = false;
		for(ll i = s.size()-1; i >= 0; --i){
			if(s[i] == 'h'){
				s.erase(i, 1);
				flg = true;
			}else if(s[i] == 'e'){
				s[i] = 'h';
				flg = true;
			}
		}
		if(flg) cnt++;
		else break;
	}
	cout << cnt << endl;

	return 0;
}