#define _USE_MATH_DEFINES
#include <cstdio>
#include <iostream>
#include <sstream>
#include <fstream>
#include <iomanip>
#include <algorithm>
#include <cmath>
#include <complex>
#include <string>
#include <vector>
#include <array>
#include <list>
#include <queue>
#include <stack>
#include <set>
#include <map>
#include <bitset>
#include <numeric>
#include <limits>
#include <climits>
#include <cfloat>
#include <functional>
#include <iterator>
#include <memory>
#include <regex>
using namespace std;

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

    int ans = 0;
    int i = 0;
    string t;
    while(i < n){
        if(s.substr(i, 5) == "phnom"){
            t += "penh";
            i += 5;
            ++ ans;
        }
        else{
            t += s[i];
            ++ i;
        }
    }
    s = move(t);
    n = s.size();

    t = string();
    if(s.find('h') != string::npos || s.find('e') != string::npos){
        for(int i=0; i<n; ++i){
            if(s[i] != 'h'){
                if(s[i] == 'e')
                    t += 'h';
                else
                    t += s[i];
            }
        }
        ++ ans;
    }
    s = move(t);
    n = s.size();
    
    int maxLen = (s.find('h') == string::npos)? 0 : 1;
    i = 0;
    while(i < n){
        if(s.substr(i, 5) == "phnom"){
            i += 5;
            int len = 1;
            while(i < n && s.substr(i, 2) == "om"){
                i += 2;
                ++ len;
            }
            ans += len;
            maxLen = max(maxLen, len + 1);
        }
        else{
            ++ i;
        }
    }
    ans += maxLen;
    cout << ans << endl;

    return 0;
}