count times a value appears but disregard duplicate values with same date

I need to count the number of times a name appears but if it appears twice for the same date, it ONLY counts as 1.

I have tried a mixture of COUNTIF, SUMIF, SUMPRODUCT formulas, and I can't seem to get it to do what I need. Please help!

I have attached a spreadsheet as reference with additional information on what I need as well.

=sum(--(frequency(iferror(match($a$2:$a$16,if($i$2:$i$16=i2,$a$2:$a$16),),),row($i$2:$i$16)-1)>0)) cse

Not exactly what I need, I need it to count for the individual driver name (listed in column K) in all 3 Driver columns, A, C, and E.

=roundup(sum(if($a$2:$e$16=l2,1/countif($i$2:$i$16,$i$2:$i$16))),)