import java.io.*;
import java.text.DecimalFormat;
import java.util.*;

public class Main {
    public static void main(String[] args) throws IOException {
        Scanner in = new Scanner(System.in);
        PrintWriter out = new PrintWriter(System.out);
        List<Double> a = new ArrayList<Double>();
        while (in.hasNextDouble() ) {
            a.add(in.nextDouble());
        }

        DecimalFormat df = new DecimalFormat("#.0000");
        for (int i = a.size() - 1; i >= 0; --i) {
            out.println(df.format(Math.sqrt(a.get(i))));
        }
    }
}