How to use proxy in telethon?

import sys
import socks

from telethon import TelegramClient
from telethon.tl.types import InputPhoneContact
from telethon.tl.functions.contacts import ImportContactsRequest
from telethon.errors import FloodWaitError, RPCError

api_id = 0  # a valid api_id
api_hash = ''  # a valid api_hash

w = input('Which: ')

host = 8.8.8.8  # a valid host
port = 80  # a valid port
proxy = (socks.SOCKS5, host, port)

client = TelegramClient('N{}'.format(w), api_id, api_hash, proxy)
client.connect()

Above code doesn’t work. what is the problem???