#include<iostream>
#include<string>
#include<cstdio>
#include<vector>
#include<cmath>
#include<algorithm>
#include<functional>
#include<iomanip>
#include<queue>
#include<ciso646>
#include<random>
#include<map>
#include<set>
#include<bitset>
#include<stack>
#include<unordered_map>
#include<utility>
#include<cassert>
#include<complex>
#include<numeric>
using namespace std;

//#define int long long
typedef long long ll;

typedef unsigned long long ul;
typedef unsigned int ui;
const ll mod = 1000000007;
const ll INF = mod * mod;
typedef pair<int, int>P;
#define stop char nyaa;cin>>nyaa;
#define rep(i,n) for(int i=0;i<n;i++)
#define per(i,n) for(int i=n-1;i>=0;i--)
#define Rep(i,sta,n) for(int i=sta;i<n;i++)
#define rep1(i,n) for(int i=1;i<=n;i++)
#define per1(i,n) for(int i=n;i>=1;i--)
#define Rep1(i,sta,n) for(int i=sta;i<=n;i++)
#define all(v) (v).begin(),(v).end()
typedef pair<ll, ll> LP;
typedef long double ld;
typedef pair<ld, ld> LDP;
const ld eps = 1e-12;
const ld pi = acos(-1.0);
//typedef vector<vector<ll>> mat;
typedef vector<int> vec;

ll mod_pow(ll a, ll n, ll m) {
	ll res = 1;
	while (n) {
		if (n & 1)res = res * a%m;
		a = a * a%m; n >>= 1;
	}
	return res;
}

struct modint {
	ll n;
	modint() :n(0) { ; }
	modint(ll m) :n(m) {
		if (n >= mod)n %= mod;
		else if (n < 0)n = (n%mod + mod) % mod;
	}
	operator int() { return n; }
};
bool operator==(modint a, modint b) { return a.n == b.n; }
modint operator+=(modint &a, modint b) { a.n += b.n; if (a.n >= mod)a.n -= mod; return a; }
modint operator-=(modint &a, modint b) { a.n -= b.n; if (a.n < 0)a.n += mod; return a; }
modint operator*=(modint &a, modint b) { a.n = ((ll)a.n*b.n) % mod; return a; }
modint operator+(modint a, modint b) { return a += b; }
modint operator-(modint a, modint b) { return a -= b; }
modint operator*(modint a, modint b) { return a *= b; }
modint operator^(modint a, int n) {
	if (n == 0)return modint(1);
	modint res = (a*a) ^ (n / 2);
	if (n % 2)res = res * a;
	return res;
}

ll inv(ll a, ll p) {
	return (a == 1 ? 1 : (1 - p * inv(p%a, a)) / a + p);
}
modint operator/(modint a, modint b) { return a * modint(inv(b, mod)); }

const int max_n = 1 << 18;
modint fact[max_n], factinv[max_n];
void init_f() {
	fact[0] = modint(1);
	for (int i = 0; i < max_n - 1; i++) {
		fact[i + 1] = fact[i] * modint(i + 1);
	}
	factinv[max_n - 1] = modint(1) / fact[max_n - 1];
	for (int i = max_n - 2; i >= 0; i--) {
		factinv[i] = factinv[i + 1] * modint(i + 1);
	}
}
modint comb(int a, int b) {
	if (a < 0 || b < 0 || a < b)return 0;
	return fact[a] * factinv[b] * factinv[a - b];
}
using mP = pair<modint, modint>;

int dx[4] = { 0,1,0,-1 };
int dy[4] = { 1,0,-1,0 };

typedef modint Data;
typedef vector<Data> Array;
typedef vector<Array> mat;
mat operator*(const mat &lhs, const mat &rhs) {
	mat ret(lhs.size(), Array(rhs[0].size(), 0));
	rep(i, lhs.size())rep(j, rhs[0].size())rep(k, rhs.size()) {
		ret[i][j] = lhs[i][k]*rhs[k][j]+ret[i][j];
	}
	return ret;
}
mat scalar(int sz, Data k) {
	mat ret(sz, Array(sz, 0));
	rep(i, sz)ret[i][i] = k;
	return ret;
}
mat operator^(const mat &lhs, const ll n) {
	if (n == 0)return scalar(lhs.size(), 1);
	mat ret = (lhs*lhs) ^ (n / 2);
	if (n % 2) {
		ret = ret * lhs;
	}
	return ret;
}


void solve() {
	string s; cin >> s;
	int n = s.size();

	int ans = 0;
	string cop;
	rep(i, n) {
		if (i + 5 <= n) {
			string u = s.substr(i, 5);
			if (u == "phnom") {
				ans++;
				cop += "penh";
				i = i + 4;
			}
			else {
				cop.push_back(s[i]);
			}
		}
		else cop.push_back(s[i]);
	}
	s = cop; n = cop.size();cop.clear();
	rep(aa, 2) {
		rep(i, n) {
			if (s[i] == 'e') {
				cop.push_back('h');
			}
			else if (s[i] != 'h') {
				cop.push_back(s[i]);
			}
		}
		if (s != cop)ans++;
		s = cop; n = s.size(); cop.clear();
		rep(i, n) {
			if (i + 5 <= n) {
				string u = s.substr(i, 5);
				if (u == "phnom") {
					ans++;
					cop += "penh";
					i = i + 4;
				}
				else {
					cop.push_back(s[i]);
				}
			}
			else cop.push_back(s[i]);
		}
		s = cop; n = s.size();
	}
	int dep = 0;

	rep(i, n) {
		if (s[i] == 'h')dep = max(dep, 1);
		if (s[i] == 'e')dep = max(dep, 2);
		if (i + 4 <= n) {
			string u = s.substr(i, 4);
			if (u == "penh") {
				int le = i + 4;
				int num = 0;
				while (le + 1 < n) {
					if (s[le] == 'o'&&s[le + 1] == 'm') {
						num++;
						le += 2;
					}
					else break;
				}
				ans += num;
				dep = max(dep, num + 2);
			}
		}
	}
	ans += dep;
	cout << ans << endl;
}


signed main() {
	ios::sync_with_stdio(false);
	cin.tie(0);
	//cout << fixed << setprecision(10);
	//init_f();
	//init();
	//int t; cin >> t; rep(i, t)solve();
	solve();
	stop
		return 0;
}