Suppose that a perfectly competitive firm faces a market price of $12 per unit, and at this price the upward-sloping portion of the firm's marginal cost curve crosses its marginal revenue curve at an output level of 1,800 units. If the firm produces 1,800 units, its average variable costs equal $7.00 per unit, and its average fixed costs equal $1.00 per unit.

What is the firm's profit-maximizing (or loss-minimizing) output level?__________.

(Enter your response as a whole number -- include the minus sign if necessary).