S = input()

ans = 0
if "phnom" in S:
    ans += 1
    newS = []
    S = list(S)
    S += ["#"]*4
    i = 0
    while i < len(S)-4:
        if S[i] == "p" and S[i+1] == "h" and S[i+2] == "n" and S[i+3] == "o" and S[i+4] == "m":
            newS += ["p", "e", "n", "h"]
            i += 5
        else:
            newS.append(S[i])
            i += 1
    S = "".join(newS)
S = list(S)
newS = []
for i in range(len(S)):
    if S[i] == "e":
        newS.append("h")
    elif S[i] == "h":
        continue
    else:
        newS.append(S[i])

if newS:
    ans += 1
    i = 0
    num = 0
    while i < len(newS)-2:
        if newS[i] == "p" and newS[i+1] == "h" and newS[i+2] == "n":
            j = i+3
            cnt = 0
            while j < len(newS)-1 and newS[j] == "o" and newS[j+1] == "m":
                j += 2
                cnt += 1
            num = max(num, cnt)
            i = j-2
        else:
            i += 1
    if num > 0:
        ans += num*2+1
    elif "h" in newS or "e" in newS:
        ans += 1
print(ans)