The local Phi Theta Kappa chapter is selling lemon shakeups on campus as a fundraiser for their trip to Nerd Nation this year. PTK members are volunteering their time to man the booth, but the chapter spent $849 on supplies to make the shakeups. They intended to charge $2.78 per shakeup. How many shakeups will the chapter have to sell to break even? Round your answer to the first shakeup that gives a profit.