Jatzz Subway Travel

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Problem description: Jatzz has recently started commuting by subway. We know that a one ride subway ticket costs 'a' rubles. Besides, Jatzz found out that he can buy a special ticket for 'm' rides (he can buy it several times). It costs 'b' rubles. Jatzz did the math; he will need to use subway 'n' times. Help Jatzz, tell him what is the minimum sum of money he will have to spend to make n rides?

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solution.cppC++17

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