Count entries in a range formula required

Good morning friends,
In my file I want to count the entries in range b6:y6 in cell d4. I require a formula to count the entries range b6:y6 in cell d4.
Now in my file there are 3 entries in the range b6:y6 which comes from the range b10:y10 as a result of formula in b6:y6, =b10 respectively.
Please suggest me a formula to count entries. I used countif formula but there was a error incorrect formula.
Thanking you in anticipation.

Mukesh