n=int(input())
S=input()
T=input()

ans=2**61-1

dif=0
for i in range(n):
    if S[i]!=T[i]:
        dif+=1

if dif%2==0:
    ans=dif

U=S[::-1]

dif=0
for i in range(n):
    if T[i]!=U[i]:
        dif+=1

if dif%2==1:
    ans=min(ans,dif)

print(ans)