Boy and Chocolates

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A boy wants to buy $X$ chocolates from the shop. He has to pay $Y$ dollars for the first chocolate, $2Y$ dollars for the second one and so on (in other words, he has to pay $i$*$K$ dollars for the $i$$th$ chocolate). He has $N$ dollars. How many dollars does he have to borrow from his friend to buy $X$ chocolates? ###Input: - A single line containing three spaced integers $Y$, $N$ and $X$, the p

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solution.cppC++17

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