On July 1, an investor holds 100,000 shares of a certain stock. The market price is $30 per share. The investor is interested in hedging against movements in the market over the next month and decides to use the September Mini S&P 500 futures contract. The index is currently 3,000 and one contract is for delivery of $50 times the index. The beta of the stock is 1.10.

What strategy should the investor follow to reduce beta to 0? Answer a positive number if he should buy the contracts or a negative number if he should sell.