import java.math.RoundingMode;
import java.text.DecimalFormat;
import java.util.Scanner;

public class Timus {
    public static void main(String[] args) {
        String regexp = "[\\n?\\s]+";
        Scanner c = new Scanner(System.in);
        String data = c.nextLine();
        String[] numbers = data.split(regexp);

        for (int i = numbers.length - 1; i >= 0; i--) {
            System.out.println(truncateSqrt(numbers[i]));
        }
    }

    private static String truncateSqrt(String s) {
        DecimalFormat fmt = new DecimalFormat("0.0000");
        fmt.setRoundingMode(RoundingMode.DOWN);

        double sqrt = Math.sqrt(Long.parseLong(s));
        return fmt.format(sqrt);
    }
}