#include <iostream>
#include <cstdio>
#include <string>
#include <cstring>
#include <deque>
#include <list>
#include <queue>
#include <stack>
#include <vector>
#include <utility>
#include <algorithm>
#include <map>
#include <set>
#include <complex>
#include <cmath>
#include <limits>
#include <climits>
#include <ctime>
#include <cassert>
#include <numeric>
#include <functional>
#include <bitset>

using namespace std;
using lint = long long int;
long long int INF = 1001001001001001LL;
int inf = 1000000007;
long long int MOD = 1000000007LL;
double PI = 3.1415926535897932;

template<typename T1,typename T2>inline void chmin(T1 &a,const T2 &b){if(a>b) a=b;}
template<typename T1,typename T2>inline void chmax(T1 &a,const T2 &b){if(a<b) a=b;}

#define ALL(a) a.begin(),a.end()
#define RALL(a) a.rbegin(),a.rend()

/* do your best */

pair<string, int> op1(const string &s) {
  // phenom を penh に置換
  string t = "";
  int cnt = 0;

  for(int i = 0; i < s.size(); i++) {

    if(i + 5 <= s.size() and s.substr(i, 5) == "phnom") {
      i += 4;
      t += "penh";
      cnt++;
    } else {
      t += s[i];
    }
  }
  return {t, cnt};
}

pair<string, int> op2(const string &s) {
  // h を消して e -> h に置換
  string t = "";
  int cnt = 0;

  //  h を消す
  for(int i = 0; i < s.size(); i++) {
    if(s[i] == 'h') continue;
    t += s[i];
    cnt = 1;
  }

  // e -> h
  for(int i = 0; i < t.size(); i++) {
    if(t[i] == 'e') {
      t[i] = 'h';
      cnt = 1;
    }
  }

  return {t, cnt};
}

int main() {
  
  // maybe TLE
  string s; cin >> s;
  // cout << op1(s).first << " " << op2(s).first << endl;
  int ans = 0;
  while(1) {
    string res1;
    int cnt1;
    tie(res1, cnt1) = op1(s);
    string res2;
    int cnt2;
    tie(res2, cnt2) = op2(s);

    if(s != res1) {
      s = res1;
      ans += cnt1;
    } else if(s != res2) {
      s = res2;
      ans += cnt2;
    } else break;
  }

  cout << ans << endl;
  return 0;
}