Finding maximum of column totals by dates

Dear All

I would like to find the maximum of column totals by dates:

In the example below, for 01/08/21
Count1 = 1 + 0 + 1 = 2
Count2 = 1 + 1 + 1 = 3
Count3 = 1 + 0 + 0 = 1
Count4 = 0 + 0 + 0 = 0
MaxCount = MAX(2,3,1,0) = 3

Thank you!

Maximum of sum of column totals by dates.png