ans=0
n=int(input())
a=list(map(int,input().sprit()))
b=list(map(int,input().sprit()))
c=[0]
for i in range(n):
    if a[i]==b[i]:
        c.append(0)
    else:
        c.append(1)
c.append(0)
for i in range(n+1):
    if c[i]!=c[i+1]:
        ans+=1
print(ans/2)