N=int(input())
S=list(input())
T=list(input())
#偶数回で
cnt1=0
for i in range(N):
    if S[i]!=T[i]:
        cnt1+=1
S=list(reversed(S))
cnt2=0
for i in range(N):
    if S[i]!=T[i]:
        cnt2+=1
if cnt1%2==0:
    print(cnt1)
else:
    print(cnt2)