#include <stdio.h>
#include <math.h>

main()
{
	long double f = 1.0;

	long double p = 1.0;
	long double z = 1.0;
	long double a = 1.0;
	long double b;


	printf("%.45Lf\n", 4.0*atanl(f));

	do
	{
		z = p;
		p /= 2.0 ;
		b = a + p;

	} while( b != a );

	printf("%.45Lf\n",z);
	exit (0);
}