import sys

# sys.setrecursionlimit(200005)
# sys.set_int_max_str_digits(200005)
int1 = lambda x: int(x)-1
pDB = lambda *x: print(*x, end="\n", file=sys.stderr)
p2D = lambda x: print(*x, sep="\n", end="\n\n", file=sys.stderr)
def II(): return int(sys.stdin.readline())
def LI(): return list(map(int, sys.stdin.readline().split()))
def LLI(rows_number): return [LI() for _ in range(rows_number)]
def LI1(): return list(map(int1, sys.stdin.readline().split()))
def LLI1(rows_number): return [LI1() for _ in range(rows_number)]
def SI(): return sys.stdin.readline().rstrip()

dij = [(0, 1), (-1, 0), (0, -1), (1, 0)]
# dij = [(0, 1), (-1, 0), (0, -1), (1, 0), (1, 1), (1, -1), (-1, 1), (-1, -1)]
# inf = -1-(-1 << 31)
inf = -1-(-1 << 62)

# md = 10**9+7
md = 998244353

def op1(s):
    global ans
    res=[]
    i=0
    for c in s:
        res.append(c)
        if c==t[i]:
            i+=1
        elif c==t[0]:
            i=1
        else:
            i=0
        if i==5:
            ans+=1
            i=0
            for _ in range(5):res.pop()
            res+=["p","e","n","h"]
    return res

def op2(s):
    global ans
    update=0
    res=[]
    for c in s:
        if c=="h":
            update=1
            continue
        if c=="e":
            c="h"
            update=1
        res.append(c)
    ans+=update
    return res

t="phnom"
s=list(SI())
ans=0
s=op1(s)
s=op2(s)
s=op1(s)
s=op2(s)
# print(ans,s)

ish=ise=0
mx=0
cur=0
i=0
for c in s:
    if c=="h":ish=1
    if c=="e":ise=1
    if c==t[i]:
        i+=1
    elif c==t[0]:
        i=1
        cur=0
    else:
        i=0
        cur=0
    if i==5:
        ans+=1
        cur+=1
        mx=max(mx,cur)
        i=3

if mx:
    print(ans+mx+1)
elif ise:
    print(ans+2)
elif ish:
    print(ans+1)
else:
    print(ans)