Well, it's simple, really.
Divide everything by two and a half. Multiply it by the square root of -146.897. Somewhere in there is an I. Take that eye, forget about the past or future, and just take a close look at the present. Open the present, and you will find a saw. See what you saw, and you'll be back in the past. Go past the first year, and take a left in Turkey. Pull the turkey out of the oven, place it on the table, and enjoy your Thanksgiving.
Wait... It's not May... It's might. Use that might to defeat the evil dragon, who is guarding the key. Use the key to unlock the wonders of the world. The Seven Wonders of the World to be exact. You'll find that sometimes you wonder why the world thinks #7 is so lucky. Irish men will bust down your door, and prelude to a long speech, more of a tune in B minor, as to why said number is lucky. Use that to tune your ukelele, and play something by Breaking Benjamin. Sure, Benjamin Franklin will be in pain, but at least you'll feel much more safe. That key you found before, if you still have it, use that to unlock the safe.
You'll find that 42 is in there. THAT, my son, is the answer to your question.