Bitrix 24 Automation Expert Needed - Simple Setup

We need someone with experience in setting up automation rules in Bitrix 24.

The task is to setup a formula like:

1) Deal enters specific stage
2) If after 5 days there is no activity an email is sent to client.
3) Then is still not contact at 10 days, then 15.
4) Also at 15 days the deal will move to 'deal lost'

NOTE: It should be setup as 'working days' only.

IMPORTANT - You should have your own Bitrix account to setup and test this rule, and make sure is works 100% before advising the tried and tested method.

Thanks
Chris.