Protect a formula from the rest of a sheet, possible?

Good afternoon experts,

My question today is if it is possible to protect a formula from the rest of a sheet.
The excel it is a calculation of prices and different people has access to the excel.
I would like to protect the formula, let see in column C, for making any changes or what ever.
Column A, B and C it is for the people to put the data and D contains the formula.
Please see excel attached.
Thanks a lot in advance for you attention and answer.