Add an additional condition where the value is greater than 0

Hi folks, 

The following formula is used to return the number of times a week number is found in Sheet1

=COUNTIF(Sheet1!$R$5:$R$1000,D24)

Now I only want the number of times the week number is found to only return a result if the value(s) in colO has a value greater than (0)

The range to include in the formula:

Sheet1!$O$5:$O$1000

To give you a better idea what I am looking to do here is my (poor) attempt to include the condition in the original formula:

=COUNTIF((Sheet1!$R$5:$R$1000,D24),Sheet1!$O$5:$O$1000, >0))

Thank you for taking a look!