import java.util.Scanner;

public class squareRoot {
	public static void main(String[] args) {
	    Scanner input = new Scanner(System.in);
	    System.out.print("Enter your input: ");
	    int n = input.nextInt();

	    if (n < 0) {
		    System.out.println("It's impossible to get square root of a negative number");
			  return;
	    }

	    double output = Math.sqrt(n);
	    System.out.print(output);
	}
}