d051 糟糕，我發燒了！

//參考網頁 http://www.wretch.cc/blog/mntkey/21031128

#include 
#include 
using namespace std;

int main()
{
    double F;
    double C;
    cin >> F;
    C = ( F - 32 ) * 5 / 9;
    cout << fixed << setprecision(3) << C << endl;
    return 0;
}