import java.util.Scanner;
public class einfachesif {
	public static void main(String[] args) {
		double magicNumber;
		Scanner in = new Scanner(System.in);
		
		System.out.println("Zahl angeben:");
		magicNumber = in.nextDouble();
		
		if(magicNumber >= 0)
			System.out.println("Magic Result: " + Math.sqrt(magicNumber));
		else
			System.out.println("Illegal Magic Input...");
	}
}