#include <bits/stdc++.h>   using namespace std;   int main() {     int n;     cin >> n;     string intial, code;     cin >> intial >> code;     int res = 0;     for (int i = 0; i < n; i++) {       int a = (((intial[i] -  0 ) - (code[i] -  0 )) + 10) % 10;       int b = (((code[i] -  0 ) - (intial[i] -  0 )) + 10) % 10;       res += min(a, b);     }     cout << res;     return 0;   }   