func main()
	var n: int :: cui@inputInt()
	var cs: []int :: #[3]int
	for i(0, n - 1)
		do cs[cui@inputInt()] :+ 1
	end for
	var ct: []int :: #[3]int
	for i(0, n - 1)
		do ct[cui@inputInt()] :+ 1
	end for
	
	var ans: int :: 0
	if(cs[2] <> 0)
		if(ct[2] <> 0)
			do ans :: (cs[2] + ct[2]) * n - cs[2] * ct[2]
		else
			do ans :: cs[2] * n + cs[1]
		end if
	else
		if(ct[2] <> 0)
			do ans :: ct[2] * n + ct[1]
		else
			do ans :: lib@max(cs[1], ct[1])
		end if
	end if
	do cui@print("\{ans}\n")
end func