#include <iostream>
using namespace std;
 class Temperature {
     double celsius;
     public:
     Temperature(double) {
         return(celsius*9.0/5.0)+32.0;
         
     }
 };
 
 int main() {
     double c;
     cin >> c;
     
     if (c < 0) {
         cout << "Invalid input";
         return 0;
     }
     Temperature t(c);
     cout<<t.toFarenheit();
     
     return 0;
 }