#include <bits/stdc++.h>   using namespace std;   int main() {     int k, r;     cin >> k >> r;     int count = 1;     int aux = k;     while (true) {       if ((k % 10 == 0) || (abs(k - r) % 10 == 0)) {         break;       } else {         k += aux;         count++;       }     }     cout << count << endl;   }   