Occurrences in rows

Occurrences in rows

Hi all, need some advice!

I have the table below with details on the attendance of people at a class.

What I want to do is to add up how many people (ID) have been in attendance anytime in the last 5 months measured from May. Note this is not how many times individuals have attended.

For example

Member ID A was present in Mar, Apr and May
Member ID B was present in Apr, May
Member ID C was present in Apr
Member ID D was present in Mar and May
Member E was not present at all

So the answer for how many members were present in the 5 months of May and previous is 4.

Thanks!

ID
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
A
0
0
1
1
1
0
0
0
0
0
0
0
B
0
0
0
1
1
0
0
0
0
0
0
0
C
0
0
0
1
0
0
0
0
0
0
0
0
D
0
0
1
0
1
0
0
0
0
0
0
0
E
0
0
0
0
0
0
0
0
0
0
0
0


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