I'm struggling with formula field. I need to write a formula and also i need some constant values for it but i cannot assign a number to these constant values. For example; My formula is a * b = c

a = input from the customer

b = constant which i decide before (note: customer will not see this value)

c = result

how can i assign a number for my formula. All the fields i can pick is used for input from customer. Thank you for your help.