INCREASE YOUR SKILLS

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Kshitij has recently started solving problems on codechef. As he is real problem solving enthusiast, he wants continuous growth in number of problems solved per day. He started with $a$ problems on first day. He solves $d$ problems more than previous day. But after every $k$ days , he increases $d$ by $inc$ . Can you guess how many questions he will solve on $nth $ day ? ###Input:

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solution.cppC++17

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