import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
int F = sc.nextInt();
int C=0;
C = 5*(F-32)/9;
System.out.println("Celsius = "+C);
}
}
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
int F = sc.nextInt();
int C=0;
C = 5*(F-32)/9;
System.out.println("Celsius = "+C);
}
}