import sys def II(): return int(sys.stdin.readline()) def MI(): return map(int, sys.stdin.readline().split()) def LI(): return list(map(int, sys.stdin.readline().split())) def SI(): return sys.stdin.readline()[:-1] def LLI(rows_number): return [LI() for _ in range(rows_number)] int1 = lambda x: int(x) - 1 def MI1(): return map(int1, sys.stdin.readline().split()) def LI1(): return list(map(int1, sys.stdin.readline().split())) p2D = lambda x: print(*x, sep="\n") dij = [(0, 1), (1, 0), (0, -1), (-1, 0)] def main(): s = SI() ans = 0 while 1: ans += s.count("phnom") s = s.replace("phnom", "penh") if "h" in s or "e" in s: s = s.replace("h", "") s = s.replace("e", "h") ans += 1 else: break print(ans) main()