Suppose I bought 1 share of a stock at price $100 at time t=1. Later sold 2 shares at (including short-selling)

Suppose I bought 1 share of a stock at price $100 at time t=1. Later sold 2 shares at (including short-selling) $120 at time t=2, and then later bought 1 share at price $80 at time t=3. What is my overall profit (or loss) in trading?