Question about using if condition for a parameter evaluation

Hi All, I have a question regarding using the if condition inside the "add line" block, would anyone help me about this?

My target is to assign a value to the parameter "c_calculated". If logic=1, I want to use an equation to calculate the variable "c_calculated". If logic=0, I want to assign a number "c_initial" to the variable "c_calculated" . However, it seems like Mathcad does not allow me to do it in the way showing below. Would anyone tell me what is wrong with this?

Thank you!