# coding: utf-8
# Your code here!

import sys
readline = sys.stdin.readline
read = sys.stdin.read

#n,*a = [int(i) for i in read().split()]
#a = [int(i) for i in readline().split()]
#n = int(input())

s = input()

ans = 0
c = s.count("phnom")
if c==0: 
    if "h" in s or "e" in s:
        ans = 1
        s = s.replace("h","").replace("e","h")
        c = s.count("phnom")
        if c==0:
            if "h" in s or "e" in s:
                print(ans+1)
                exit()
            else:
                print(ans)
                exit()
    else:
        print(0)
        exit()

s = s.replace("phnom","penh").replace("h","").replace("e","h")
ans += c+1

c = s.count("phnom")
if c==0: 
    if "h" in s or "e" in s:
        ans = 1
        s = s.replace("h","").replace("e","h")
        c = s.count("phnom")
        if c==0:
            if "h" in s or "e" in s:
                print(ans+1)
                exit()
            else:
                print(ans)
                exit()
    else:
        print(0)
        exit()



s = s.replace("phn","X").replace("om","Y")


def getans(s,ans):
    q = []
    res = 0
    depth = 0
    for i in s[::-1]:
        if not q: q.append(i)
        else:
            if i=="X":
                r = 0
                while q and q[-1]=="Y":
                    q.pop()
                    r += 1
                res += r
                depth = max(depth,r)
            q.append(i)
    
    
    if res==0:
        print(ans+1)
        exit()
    else:
        print(ans+res+depth+1)

getans(s,ans)