## https://yukicoder.me/problems/no/2209

import math

def main():
    N = int(input())
    S = input()
    T = input()

    answer = float("inf")
    # 偶数回
    c = 0
    for i in range(N):
        if S[i] != T[i]:
            c += 1

    if c % 2 == 0:
        answer = min(answer, c)
    
    S_ = S[::-1]
    c = 0
    for i in range(N):
        if S_[i] != T[i]:
            c += 1
    if c % 2 == 1:
        answer = min(answer, c)    

    print(answer)



if __name__ == "__main__":
    main()