import sys
input = sys.stdin.readline

N=int(input())
S=list(map(int,input().strip()))
T=list(map(int,input().strip()))
INF=10**9
ans=INF
x=0
for s,t in zip(S,T):
    if s!=t:x+=1
if x%2==0:
    ans = x
x=0
for s,t in zip(S[::-1],T):
    if s!=t:x+=1
if x%2==1:
    ans = min(ans, x)
print(ans)