How to count the last event if the last event =Open

I want to create a report which shows me the count of events if the first Event action = **Open** **Event Action Timestamp** 123 Open 22-01-2019 123 Complete 23-01-2019 345 Open 22-01-2019 678 Open 24-01-2019 678 Open 25-01-2019 678 Closed 25-02-2019 999 Pending 22-01-2019 999 Closed 22-02-2019 999 Open 22-03-2019 Count of Open = 2