Price Per Stage - Pricing Rule

Hi,

I need a pricing rule that adjusts based on the total number of views a customer designs (e.g., front, back, left side, right side). The pricing should be: $0 for 1 view, +$16 for 2 views, +$32 for 3 views, and +$48 for 4 views.

How can I achieve this? 

Thanks,

Nick