Last Puzzles (Long Logic Puzzle)

You and Me are playing bets. I take $10 from you and that begins our game. I shuffle the deck of cards (52 cards normal deck) and take out four random cards out of it. Now I place the cards in front of you with face down. Then I turn over the first card. You can either keep it or you can ask me to open the second card. When I turn the second card, you have the same options again till I open the third card. If you deny to keep it, you must take the fourth card no matter what the card is. Now if the card you choose has n value, I will give you $n and we will keep on playing like this till the end of the day. You may feel that this is completely over the chance. But there is a nice strategy which will allow you to win. Can you find out the strategy so that by the end of the day you have won a decent amount?

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