#18387: 不同的答案
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#include <iostream>
using namespace std;
int main() {
int h;
cin >> h;
cout << (h%15)+(h/15)*(-9)+9;
}
#include <iostream>
using namespace std;
int main() {
int h;
cin >> h;
cout << (h%15)+(h/15)*(-9)+9;
}