import java.util.Scanner;

public class Temp2 {

	public static void main(String[] args) {
		double fahrenheit;
		double celcius;

		Scanner input = new Scanner(System.in);
		
		System.out.print("Enter a temperature in Fahrenheit: ");
		fahrenheit = input.nextDouble();
		
		if (fahrenheit < -273.15)
			throw new IllegalArgumentException("Temperature must be at least -273.15");

		System.out.print(fahrenheit + " Fahrenheit is ");
				
		celcius = 5.0 / 9 * (fahrenheit - 32.0);

		System.out.println(celcius + " Celcius");

	}

}