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