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- #include <iostream>
- using namespace std;
- int main() {
- int x;
- cin >> x;
- int res = 2e9;
- for(int d = 0; d <= x; d++) {
- int drveni = 5 * d;
- if(drveni >= x) {
- res = min(res, d);
- }
- if(drveni <= x) {
- int metalni = (x - drveni + 9) / 10;
- if(metalni <= d and drveni + metalni * 10 >= x) {
- res = min(res, d + metalni);
- }
- }
- }
- cout << res << endl;
- return 0;
- }
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