What is the profit at the optimal integer output level?

Suppose that you can sell as much of a product (in integer units) as you like at $63 per unit. Your marginal cost (MC) for producing the qth unit is given by: This means that each unit costs more to produce than the previous one (e.g., the first unit costs 6*1, the second unit (by itself) costs 6*2, etc.). If fixed costs are $90, what is the profit at the optimal integer output level? Please specify your answer as an integer.