#include <bits/stdc++.h>

// 汎用マクロ
#define ALL_OF(x) (x).begin(), (x).end()
#define REP(i,n) for (long long i=0, i##_len=(n); i<i##_len; i++)
#define RANGE(i,is,ie) for (long long i=(is), i##_end=(ie); i<=i##_end; i++)
#define DSRNG(i,is,ie) for (long long i=(is), i##_end=(ie); i>=i##_end; i--)
#define STEP(i, is, ie, step) for (long long i=(is), i##_end=(ie), i##_step = (step); i<=i##_end; i+=i##_step)
#define UNIQUE(v) do { sort((v).begin(), (v).end()); (v).erase(unique((v).begin(), (v).end()), (v).end()); } while (false)
template<class T> bool chmax(T &a, const T &b) {if (a < b) {a = b; return true;} return false; }
template<class T> bool chmin(T &a, const T &b) {if (a > b) {a = b; return true;} return false; }
#define INF 0x7FFFFFFF
#define LINF 0x7FFFFFFFFFFFFFFFLL
#define Yes(q) ((q) ? "Yes" : "No")
#define YES(q) ((q) ? "YES" : "NO")
#define Possible(q) ((q) ? "Possible" : "Impossible")
#define POSSIBLE(q) ((q) ? "POSSIBLE" : "IMPOSSIBLE")
#define DUMP(q) cerr << "[DEBUG] " #q ": " << (q) << " at " __FILE__ ":" << __LINE__ << endl
#define DUMPALL(q) do { cerr << "[DEBUG] " #q ": ["; REP(i, (q).size()) { cerr << (q)[i] << (i == i_len-1 ? "" : ", "); } cerr << "] at " __FILE__ ":" << __LINE__ << endl; } while (false)
template<class T> T gcd(T a, T b) { if (a < b) std::swap(a, b); while (b) std::swap(a %= b, b); return a; }
template<class T> T lcm(const T a, const T b) { return a / gcd(a, b) * b; }

// gcc拡張マクロ
#define popcount __builtin_popcount
#define popcountll __builtin_popcountll

// エイリアス
#define DANCE_ long
#define ROBOT_ unsigned
#define HUMAN_ signed
#define CHOKUDAI_ const
using  ll = DANCE_ HUMAN_ DANCE_;
using ull = DANCE_ ROBOT_ DANCE_;
using cll = DANCE_ DANCE_ CHOKUDAI_;
using  ld = long double;
using namespace std;

// モジュール
string op1(const string &s, ll &ans) {
    ll n = s.size();
    string t; t.reserve(n);
    REP(i, s.size()) {
        bool phnom = false;
        if (i <= n-5) {
            string s2(s.begin() + i, s.begin() + i + 5);
            phnom = s2 == "phnom";
        }
        if (phnom) {
            t += "penh";
            i += 4;
            ++ans;
        } else {
            t.push_back(s[i]);
        }
    }
    return t;
}
string op2(const string &s, ll &ans) {
    string t; t.reserve(s.size());
    bool sousa = false;
    for (const char &c : s) {
        if (c == 'e') {
            t.push_back('h');
            sousa = true;
        } else if (c != 'h') {
            t.push_back(c);
        } else {
            sousa = true;
        }
    }
    if (sousa) ++ans;
    return t;
}

// 処理内容
int main() {
    
    // インタラクティブ問題では除去した方がいいかも
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    
    string s; cin >> s;

    ll ans = 0;
    REP(i, 2) {
        string s1 = s;
        ll cand1 = 0;
        if (i) s1 = op2(s1, cand1);
        while (true) {
            ll c = cand1;
            s1 = op1(s1, cand1);
            if (cand1 == c) break;
            s1 = op2(s1, cand1);
        }
        s1 = op2(s1, cand1);
        s1 = op2(s1, cand1);
        chmax(ans, cand1);
    }

    cout << ans << endl;

}