Can you please help with showing the steps behind constructing the Lagrange function for the scenario given?

Problem 3: Recruiting Costs, Operating Costs, and Nash-Bargained Wages (45 points). Consider the following extension of firms in the search and matching framework. The representative firm's profit function is A. f (no ) - w.n -@.v-4, in which I (the Greek uppercase letter "Psi") is a fixed positive operating cost that must be paid in order for the firm to maintain its ongoing business activities. The operating cost 1 > 0 are exogenous and are presumed to be independent of the recruiting cost @>0. The goods production function f (n ) is increasing in n and has diminishing marginal product in n (i.e., f'(n ) > 0 and f"(n )