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Rehearse mathematics
I don't know the format, but I have some ideas:

Arithmetic progression's summation formula is s= (the first term+the last term) * the number of terms and then divided by 2 (the proof is abbreviated).

Suppose the number of people in the first row is a 1, then the last item is at least a 16.

Because a 16=a 1+ 15, there is (a1+a1+15) *16/2 =/kloc-.

The solution is a 1=55,

So there are 55 people in the first row.

I hope I have the right question, or that's it.