func main()
	var n: int :: cui@inputInt()
	var c: int :: cui@inputInt()
	var v: int :: cui@inputInt()
	
	var ans: int :: lib@intMax
	for numCV(1, 20)
		var costC: int :: (c + v) * numCV - 2 * v
		var ratio: int :: 2 ^ (numCV - 1)
		var numV: int :: ((n - 1) / ratio + 1)
		var costV: int :: v * numV
		var cost: int :: costC + costV
		do ans :: [ans, cost].min()
	end for
	
	do cui@print("\{ans}\n")
end func