Problem 4

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Yash is going for a tour lasting N days. He takes packages of chapati for food. Each package has K chapatis. On the ith day, he eats Ai pieces of chapati. Unfortunately, Yash, as we know, is very lazy, always forgets to close the package of chapatis, so each day the last piece of chapati becomes exposed to mold (a fungus), and is no longer suitable for eating and is thrown away. Suppose if K = 4

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