/* package whatever; // don't place package name! */
 
import java.util.*;
import java.math.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		// From http://w...content-available-to-author-only...n.com/pi/digits/100.
		System.out.println(new BigDecimal("3.1415926535897932384626433832795028841971693993751058209749445923078164062862089986280348253421170679").divide(BigDecimal.valueOf(2)));
	}
}

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