import java.util.*;
public class main{
    public static void main(String[] args) {
        try{
            int a,b;
            Scanner in=new Scanner(System.in);
            System.out.println("C=");
            a=in.nextInt();
            b=a*9/5+32;
            in.close();
            System.out.print("F="+b);
        }catch(Exception e){
            System.out.println("Input error!");
        }
    }
};