n = int(input())
s = input()
t = input()
if s.count("1") % 2 == t.count("1") % 2:
	# EVEN
	ans = 0
	for i in range(n):
		if s[i] != t[i]:
			ans += 1
	print(ans)
else:
	# ODD
	ans = 0
	for i in range(n):
		if s[i] != t[n-i-1]:
			ans += 1
	print(ans)