#include <bits/stdc++.h>

using i64 = long long;

int main() {
    std::ios::sync_with_stdio(false);
    std::cin.tie(nullptr);
    
    int n;
    std::cin >> n;
    
    std::string s, t;
    std::cin >> s >> t;
    
    int ans = 1E9;
    
    for (int v = 0; v < 2; v++) {
        int dif = 0;
        for (int i = 0; i < n; i++) {
            dif += (s[i] != t[i]);
        }
        
        if (dif % 2 == v) {
            ans = std::min(ans, dif);
        }
        std::reverse(t.begin(), t.end());
    }

    std::cout << ans << "\n";
    
    return 0;
}