Exun and the Pizzas

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The Exunites are preparing for the $2025$ edition of their annual event, [Exun](https://exunclan.com)! After a long day of work, they go to the canteen to buy refreshments. At the canteen, Chef is selling $N$ pizzas. However, the Exunites only require $K$ pizzas. Each pizza costs $R$ rupees. Chef wants to know: after selling $K$ pizzas to the Exunites, how much revenue can he obtain by s

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solution.cppC++17

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