func_code_string: #include <bits/stdc++.h>   using namespace std;   bool isPrime(int n) {     if (n <= 3) {       return true;     }     if (n % 2 == 0 || n % 3 == 0) return false;     for (int i = 5; i * i <= n; i = i + 6)       if (n % i == 0 || n % (i + 2) == 0) return false;     return true;   }   int main() {     ios_base::sync_with_stdio(false);     cin.tie(NULL);     cout.tie(NULL);     int n, k;     cin >> n >> k;     int i = 1;     int sum;     while (1) {       sum = n * i;       if (sum % 10 == k || sum % 10 == 0) {         break;       }       i++;     }     cout << i;     return 0;   }   