I agree with steve however without understanding the use of boolean logic i wouldnt expect you to get to that answer. However have a look at this website (i found it very usefull while studying)
Altho a quik fix will solve your problem for now it wont aid u to learn and i imagine this is for a college project??
My best advice would be to take a look at that website and/or text books etc.. and see if you can "simplify" that equation. Make sure you completly understand what you are attempting to achieve.
Then come back here if u get stuck and we can try to point you in the right direction.