s = input()
n = len(s)


ans = 0
flag = False
for i in range(n - 3):
    if s[i:i+4] == "penh":
        flag = True
        tmp = 0
        flag_o = False
        for j in range(i + 4, n):
            if s[j] == "h":
                continue
            if s[j] == "e":
                if tmp >= 1:
                    continue
                else:
                    ans += tmp * 2
                    break
            if s[j] == "o" and not flag_o:
                flag_o = True
                continue
            if s[j] == "m" and flag_o:
                flag_o = False
                tmp += 1
                continue
            else:
                ans += tmp * 2
                break
        else:
            ans += tmp * 2

for i in range(n - 4):
    if s[i:i+5] == "phnom":
        tmp = 0
        flag_o = False
        flag = True
        for j in range(i + 5, n):
            if s[j] == "h":
                continue
            if s[j] == "e":
                if tmp >= 1:
                    continue
                else:
                    ans += tmp * 2 + 1
                    break
            if s[j] == "o" and not flag_o:
                flag_o = True
                continue
            if s[j] == "m" and flag_o:
                flag_o = False
                tmp += 1
                continue
            else:
                ans += tmp * 2 + 1
                break
        else:
            ans += tmp * 2 + 1

if flag:
    ans += 2
if "h" in s:
    ans = max(ans, 1)
if "e" in s:
    ans = max(ans, 2)
if ans == 0:
    print(ans)
    exit()
    
res = ans
ans = 1

s = s.replace("h", "")
s = s.replace("e", "h")
n = len(s)
flag = False
for i in range(n - 3):
    if s[i:i+4] == "penh":
        flag = True
        tmp = 0
        flag_o = False
        for j in range(i + 4, n):
            if s[j] == "h":
                continue
            if s[j] == "e":
                if tmp >= 1:
                    continue
                else:
                    ans += tmp * 2
                    break
            if s[j] == "o" and not flag_o:
                flag_o = True
                continue
            if s[j] == "m" and flag_o:
                flag_o = False
                tmp += 1
                continue
            else:
                ans += tmp * 2
                break
        else:
            ans += tmp * 2

for i in range(n - 4):
    if s[i:i+5] == "phnom":
        tmp = 0
        flag_o = False
        flag = True
        for j in range(i + 5, n):
            if s[j] == "h":
                continue
            if s[j] == "e":
                if tmp >= 1:
                    continue
                else:
                    ans += tmp * 2 + 1
                    break
            if s[j] == "o" and not flag_o:
                flag_o = True
                continue
            if s[j] == "m" and flag_o:
                flag_o = False
                tmp += 1
                continue
            else:
                ans += tmp * 2 + 1
                break
        else:
            ans += tmp * 2 + 1

if flag:
    ans += 2
print(max(res, ans))