N=int(input())
S=list(map(int,list(input())))
T=list(map(int,list(input())))
cnt0=sum(s^t for s,t in zip(S,T))
cnt1=sum(s^t for s,t in zip(S[::-1],T))
inf=1<<30
ans=inf
if cnt0%2==0:
    ans=min(ans,cnt0)
if cnt1%2:
    ans=min(ans,cnt1)
print(ans)