#include <bits/stdc++.h> using namespace std;

int main(){ double a; cin>>a;

• [ ] cout << fixed << setprecision(5) << 5*(a-32)/9*1.00000 << endl;

  return 0; }

#include <bits/stdc++.h>

using namespace std; int main() { double f; cin >> f; cout << fixed << setprecision(5) << 5 * (f - 32) / 9; return 0; }