powershell csv capture the 1 value of three columns

Question

I have a CSV with data presented like this:..

#date,a,b,c#
10,1,0,0
11,0,0,1
12,0,1,0
13,0,1,0
14,0,0,1
15,1,0,0
16,0,1,0
17,1,0,0
18,1,0,0
19,0,0,1