def main():
    import sys
    input = sys.stdin.readline

    S = [s for s in input().rstrip('\n')]
    phnom = 'phnom'
    penh = 'penh'
    penhx = 'penh!'
    ans = 0
    for i in range(len(S) - 4):
        flg = 1
        for j in range(5):
            if S[i+j] != phnom[j]:
                flg = 0
        if flg:
            ans += 1
            for j in range(5):
                S[i+j] = penhx[j]
    if 'h' not in S and 'e' not in S:
        print(ans)
        exit()
    S_new = []
    ans += 1
    for s in S:
        if s == '!' or s == 'h':
            continue
        if s == 'e':
            S_new.append('h')
        else:
            S_new.append(s)
    S_new.append('!')
    flg = 0
    has_phnom = 0
    #print(ans)
    #print(S_new)
    n = len(S_new)
    i = 0
    om_num_max = 0
    while i < n:
        #print(flg, i)
        if flg == 0:
            if i+2 < n:
                ok = 1
                for j in range(3):
                    if S_new[i+j] != phnom[j]:
                        ok = 0
            else:
                ok = 0
            if ok:
                has_phnom = 1
                flg = 1
                i += 3
                om_num = 0
            else:
                i += 1
        elif flg == 1:
            if S_new[i] == 'o':
                flg = 2
                i += 1
            else:
                om_num_max = max(om_num_max, om_num)
                ans += om_num
                flg = 0
        elif flg == 2:
            if S_new[i] == 'm':
                om_num += 1
                flg = 1
                i += 1
            else:
                om_num_max = max(om_num_max, om_num)
                ans += om_num
                flg = 0
    if not has_phnom:
        if 'e' in S_new:
            ans += 2
        elif 'h' in S_new:
            ans += 1
    else:
        ans += 1
        ans += om_num_max
    print(ans)


if __name__ == '__main__':
    main()