🚀 go-pugleaf

Hi, I am using Excel on the Mac & I am having problems with using 
text instead of numbers. 

I have a list of items & numbers that are either S(mall), M(medium) of L(arge) 
and either N(ew) , O(ld) or blank for not there.

As a sample I would have:

1 S N
2 S O
3 M 
4 S N
5 L N

I would like to be able to calculate the number of OLD: S,M,L and New S,M,L.

I tried to use the function "=IF($B1="S",IF($C1="O",1)) on each line (on
$D, for example) and sumed up all of the 1's in $D but I doubled the
amount of data needed (I had similar functions in the $E, $F, $G columns).

Q: Is there an easy (or hard) way to match up 2 numeric fields and add up 
   the number of matches??????  Do I need to write a macro?

Any leads will be greatly appreciated.
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