#include <bits/stdc++.h>

using namespace std;

using ll = long long;

int op1(string& s) {
    int cnt = 0;
    int state = 0;
    string res = "";
    for (char c : s) {
        if (c == "phnom"[state]) {
            state++;
            if (state == 5) {
                res += "penh";
                state = 0;
                cnt++;
            }
        } else {
            for (int i = 0; i < state; ++i) {
                res += "phnom"[i];
            }
            state = (c == 'p');
            res += c;
        }
    }
    for (int i = 0; i < state; ++i) {
        res += "phnom"[i];
    }
    s = res;
    return cnt;
}

int op2(string& s) {
    int cnt = 0;
    string res = "";
    for (char c : s) {
        if (c == 'h') {
            cnt = 1;
            continue;
        } else if (c == 'e') {
            cnt = 1;
            res += 'h';
        } else {
            res += c;
        }
    }
    s = res;
    return cnt;
}

int calc(string& s) {
    int cnt = 0;
    int state = 0;
    bool f = false;
    for (char c : s) {
        if (c == "phnom"[state]) {
            state++;
            if (state == 5) {
                state = 3;
                cnt += 2;
                f = true;
            }
        } else {
            state = (c == 'p');
            cnt += f;
            f = false;
        }
    }
    cnt += f;
    return cnt;
}

int main() {
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    string s;
    cin >> s;
    int ans = 0;
    for (int i = 0; i < 2; ++i) {
        int cnt1 = op1(s);
        ans += cnt1;
        //cerr << s << endl;
        int cnt2 = op2(s);
        ans += cnt2;
        //cerr << s << endl;
        if (cnt1 == 0 && cnt2 == 0) break;
    }
    //cerr << s << ans << endl;
    ans += calc(s);
    cout << ans << "\n";
    return 0;
}