import sys

inputs = sys.stdin.readline

"""再帰関数のときセット
sys.setrecursionlimit(10**7)
import pypyjit
pypyjit.set_param('max_unroll_recursion=-1')
"""


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

    S_cnt1 = S.count('1')
    T_cnt1 = T.count('1')
    if S_cnt1 % 2 != T_cnt1 % 2:
        T = T[::-1]

    ans = 0
    for s, t in zip(S, T):
        if s != t:
            ans += 1
    print(ans)


if __name__ == '__main__':
    main()