#!/usr/bin/ python3.8
import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines

S = read().rstrip().decode()
op1 = S.count('phnom')
S = S.replace('phnom', 'penh')
T = S.replace('h', '').replace('e', 'h')

if S == T:
    print(op1)
    exit()
S = T


def solve(S):
    assert not S.count('e')
    if not S.startswith('phn'):
        if S.count('h'):
            return 0, 1
        else:
            return 0, 0
    # phn + om * k -> phn
    S = S[3:].replace('om', 'X')
    k = 0
    for i, x in enumerate(S):
        if x == 'X':
            k += 1
        else:
            break
    return k, k + 1


op2 = 1
for x, y in map(solve, S.replace('p', ' p').split()):
    op1 += x
    if op2 < 1 + y:
        op2 = 1 + y
print(op1 + op2)