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To open the door, you must use the strange "crystal lock." Your presidential key unlocks a never-before-opened safe deposit box. Inside, you discover four crystals. When you touch a crystal, it reveals a points value assigned to it. There is a target score written on a scrap of paper. To escape the vault, you must touch the crystals enough times to achieve the target score. But the paper warns that should you exceed the target score, you will lose -- and an explosive device will blow up the bank! So, take this advice: Be careful with your arithmatic.