#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
using ll = long long;
using ld = long double;
using mint = modint998244353;

int main() {
  int n; cin >> n;
  string s, t; cin >> s >> t;
  int cnts = 0, cntt = 0;
  for (int i = 0; i < n; i++) {
    if (s[i] == '1') cnts++;
  }
  for (int i = 0; i < n; i++) {
    if (t[i] == '1') cntt++;
  }
  if (cnts % 2 == cntt % 2) {
    int cnt = 0;
    for (int i = 0; i < n; i++) {
      if (s[i] != t[i]) cnt++;
    }
    cout << cnt << endl;
  } else {
    int cnt = 0;
    for (int i = 0; i < n; i++) {
      if (s[n - 1 - i] != t[i]) cnt++;
    }
    cout << cnt << endl;
  }
  return 0;
}