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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3. #define el "\n"
  4. #define ll long long
  5. #define ull unsigned long long
  6. #define se second
  7. #define fi first
  8. #define be begin()
  9. #define en end()
  10. #define Faster cin.tie(0); cout.tie(0); ios_base::sync_with_stdio(0);
  11.  
  12. int main()
  13. {
  14. Faster;
  15. int n, r; cin >> n >> r;
  16. int i = 1;
  17. while(i)
  18. {
  19. if(n * i % 10 == 0 || n * i % 10 - r == 0)
  20. {
  21. cout << i;
  22. return 0;
  23. }
  24. i++;
  25. }
  26. return 0;
  27. }
  28.  
Success #stdin #stdout 0s 5288KB
stdin
15 2
stdout
2