I have one table as below

Sr No. Grade c1 c2 c3 c4
1 A1 Yes No No Yes
2 A2 No Yes Yes Yes
3 A3 Yes No Yes No
4 A5 No Yes No Yes
5 A3 Yes No Yes Yes
6 A1 No No Yes No
7 A3 Yes Yes Yes No


Now I need to calculate how many total "Yes" c2 cloumn is having when Grade is A2 or A3.

Thanks in advance