func main()
	var n: int :: cui@inputInt()
	var a: []int :: #[n]int
	for i(0, n - 1)
		do a[i] :: cui@inputInt()
	end for
	for i(0, n - 1)
		var b: int :: cui@inputInt()
		if(b = 0)
			do a[i] :: 1 - a[i]
		end if
	end for
	
	var ans: int :: 0
	for i(0, n - 1)
		if(a[i] = 0)
			do ans :+ 1
			while(i <> n & a[i] = 0)
				do i :+ 1
			end while
		end if
	end for
	do cui@print("\{ans}\n")
end func