import java.io.*;
import java.math.*;
import java.awt.*;
import java.util.*;

public class tempcon
{
	double val;
	double sq;
	double fin;
	String str="";
	String temp="";
	Integer value;
	StringTokenizer stToken;
	int temp1,temp2,temp3,temp4,temp5,x1,x2;
	int[] array;
	int[] test;
	String s1;
	int[] x;
	int largestValue;
	int smallestValue;
	int largestValueIndex;
	int smallestValueIndex;
	Vector dummy=new Vector();

	public static void main(String arg[])throws IOException
	{
		tempcon t=new tempcon();
		t.readinput();
		t.vectorToIntArray();
		t.FindMax();
		//t.FindMin();
	}

	public void readinput()
	{

		try
		{

			//DataInputStream br=new DataInputStream(new BufferedInputStream(new FileInputStream("file.txt")));
			BufferedReader br=new BufferedReader(new FileReader("file.txt"));

			while((str=br.readLine())!=null)
			{
				stToken= new StringTokenizer(str," ",false);
				while(stToken.hasMoreTokens())
				{
					temp = stToken.nextToken();
					if(temp!=null)
					{
						//value = new Integer(temp);
						dummy.addElement(temp);
					}
				}
			}


		}
			catch(Exception e)
		{
			System.out.println("exception");
		}

	}

	public void vectorToIntArray()
	{
		Vector v = new Vector();
		v = dummy;
		{
			array = new int[v.size()];
			Enumeration e = v.elements();
			for( int i=0; e.hasMoreElements(); i++ )
			{
				try
				{
					//array = ((Integer)e.nextElement()).intValue();
					array[i] = ((Integer)e.nextElement()).intValue();

				}
					catch(ClassCastException cce)
				{
					//array = 0;
					array[i] = 0;
				}
			}
		}
			for(int i=0;i<array.length;i++)
			{
				//System.out.println(" a :"+array);
				//double val=(0.3464-(0.0692*(683.72-array)));
				double val=(0.3464-(0.0692*(683.72-array[i])));
				double sq=Math.sqrt(val);
				double fin=(-0.1732+sq)/(2*0.01732);
				System.out.println(" the value of fin :"+fin);
			}
	}


	// to findthe largest value of the temperature array

	public void FindMax()
	{
		largestValue = array[0];

		for(int i = 1; i<array.length; i++)
		{
			//if (largestValue < array) {
			if (largestValue < array[i]) {
				//largestValue = array;
				largestValue = array[i];
				largestValueIndex = i;
			}
		}

	}


	//to find the smallest value of temaperature array
	public void FindMin()
	{
		smallestValue = array[0];
		for(int i = 1; i<array.length; i++)
		{
			//if (smallestValue > array)
			if (smallestValue > array[i])
			{
				//smallestValue = array;
				smallestValue = array[i];
				smallestValueIndex =i;
			}
		}
	}


}