#include <bits/stdc++.h>   using namespace std;   int main() {     int k, r;     cin >> k >> r;     int n = 1;     while (true) {       if ((k * n - r) % 10 == 0 || (k * n) % 10 == 0) {         cout << n <<   n ;         return 0;       }       n++;     }   }   