#include <iostream>
using namespace std;
int main ()
{
int h;
cin >> h;
cout << (h+24 - 15) % 24 << endl;
return 0;
}
#include
using namespace std;int main ()
{
int h;
cin >> h;
cout << (h+24 - 15) % 24 << endl;
return 0;
}真6老鐵