Flowers and Petals

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Chef wants to give flowers to his girlfriend on Valentine's day. His girlfriend doesn't like flowers with an odd number of petals much. Chef decided to buy flowers from the nearby shop. In the shop, flowers are arranged in rows. Since it's Valentine's day, many flowers are already sold. Luckily there is one row of flowers left. In this row, there are $N$ number of flowers numbered $1$ through $

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solution.cppC++17

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