import java.io.*; public class Main { public static BufferedReader in = new BufferedReader(new InputStreamReader(System.in)); public static BufferedWriter out = new BufferedWriter(new OutputStreamWriter(System.out)); public static StreamTokenizer cin = new StreamTokenizer(new BufferedReader(new InputStreamReader(System.in))); public static PrintWriter cout = new PrintWriter(new OutputStreamWriter(System.out)); public static void main(String[] args) throws Exception { double x, b, c; cin.nextToken(); x = cin.nval; b = x / 2; while (true) { c = (b + x / b) / 2; if (Math.abs(c - b) < 0.00001) { break; } b = c; } cout.printf("%.3f", c); cout.flush(); } }
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