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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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