Use this method to get the number of members in a chat. Returns Int on success.
## Arguments
| Name | Type | Description |
| - | - | - |
| `chat_id` | `#!python3 Union[int, str]` | Unique identifier for the target chat or username of the target supergroup or channel (in the format @channelusername) |
## Response
Type: `#!python3 int`
Description: Returns Int on success.
## Usage
### As bot method bot
```python3
result: int = await bot.get_chat_members_count(...)