import java.util.*;
import java.io.*;
public class p1001 {
    public static void main(String[] args) throws Exception {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        ArrayList<String> nums = new ArrayList<String>();
        String line;
        while (true) {
            line = br.readLine();
            if (line == null) break;
            StringTokenizer st = new StringTokenizer(line);
            while (st.hasMoreTokens()) {
                nums.add(st.nextToken());
            }
        }

        for (int i = nums.size() - 1; i >= 0; i--) {
            int num = Integer.parseInt(nums.get(i));
            System.out.printf("%.4f\n", Math.sqrt(num));
        }
    }
}

you did not account for the max size limit on the input....