#include <bits/stdc++.h>   using namespace std;   int main() {     string s, c;     int n, t = 0;     cin >> n;     cin >> s >> c;     for (int i = 0; i < n; i++) {       int p = s[i], k = c[i];       if (p <= k)         t += min(abs(p - k), (p + 1) + (9 - k));       else         t += min((9 - p) + (k + 1), abs(p - k));     }     cout << t << endl;   }   