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

p="phnom"
s=list(SI())
t=[]
cnt=0
ans=0
for c in s:
    if c==p[cnt]:
        cnt+=1
    elif c=="p":
        cnt=1
    else:
        cnt=0
    t.append(c)
    if cnt==5:
        cnt=0
        for _ in range(4):t.pop()
        t+=["e","n","h"]
        ans+=1
s,t=t,[]
ish=0
ise=0
for c in s:
    if c=="h":
        ish=1
        continue
    if c=="e":
        ise=1
    t.append(c)
s=t
p2="penom"
i=0
cur=mx=0
for c in s:
    if c==p2[i]:
        i+=1
        if i==5:
            ans+=1
            cur+=1
            i=3
    elif c=="p":
        i=1
    else:
        mx=max(mx,cur)
        i=0
    # print(c,i,cur,mx)
mx=max(mx,cur)

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