how many more long future notional contracts mature by 2012 than short futures?
table of contents valero energy corporation and subsidiaries notes to consolidated financial statements ( continued ) cash flow hedges cash flow hedges are used to hedge price volatility in certain forecasted feedstock and refined product purchases , refined product sales , and natural gas purchases . the objective of our cash flow hedges is to lock in the price of forecasted feedstock , product or natural gas purchases or refined product sales at existing market prices that we deem favorable . as of december 31 , 2011 , we had the following outstanding commodity derivative instruments that were entered into to hedge forecasted purchases or sales of crude oil and refined products . the information presents the notional volume of outstanding contracts by type of instrument and year of maturity ( volumes in thousands of barrels ) . notional contract volumes by year of maturity derivative instrument 2012 .

| Derivative Instrument | Notional Contract Volumes by Year of Maturity 2012 |
| :--- | :--- |
| Crude oil and refined products: |  |
| Swaps – long | 5,961 |
| Swaps – short | 5,961 |
| Futures – long | 38,201 |
| Futures – short | 36,637 |
| Physical contracts – short | 1,564 |

.

long_futures_2012 = 38201
short_futures_2012 = 36637
answer = long_futures_2012 - short_futures_2012