import re
s = input()
tt = s.maketrans({'h':None, 'e':'h'})
r = 0
i = 2
while i and ('h' in s or 'e' in s):
	r += s.count('phnom') + 1
	s = s.replace('phnom', 'penh').translate(tt)
	i -= 1
m = [len(f[0])//2 for f in re.findall('(?<=phn)((om)*)', s)]
r += sum(m) + max(m) + 1 if m else 0
print(r)