On a particular day there are 1,800 trades in a particular futures contract. Of the 1,800 trades on the long side of the market, 1,240 were closing out positions and the remainder were new positions. Of the 1,800 trades on the short side of the market, 765 were closing out positions and the remainder were entering new positions. What is the impact of the day's trading on the level of open interest in the contract?

560

-205

-475

475

-1035