func main()
	var n: int :: cui@inputInt()
	var c: int :: cui@inputInt()
	var v: int :: cui@inputInt()
	
	var ans: int :: lib@intMax
	for i(1, n)
		var cost: int :: c + (i - 1) * v
		var num: int :: i
		while(num < n)
			do num :* 2
			do cost :+ c + v
		end while
		do ans :: [ans, cost].min()
	end for
	
	do cui@print("\{ans}\n")
end func