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- #include <iostream>
- #include <cmath>
- #include <algorithm>
- #include <vector>
- #include <string>
- #include <set>
- using namespace std;
- int main () {
- int k, r;
- cin >> k >> r;
- for (int i = 1; i < 11; i++) {
- if ((((k * i) % 10) == r) || (((k * i) % 10) == 0)) {
- cout << i << endl;
- return 0;
- }
- }
- }
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