import java.*;
import java.math.*;
public class chengxu
{
	public static void main(String args[])
	{
	  double  x=0;
		double P[]=new double[4];
		for(int i=0 ;i<=3;i++)
		{
			 P[i]=0.25;
        
			System.out.println(P[i]);
     
		  	x=x+(-1)*P[i]*(Math.log(P[i]))/(Math.log(2));
		  }
		  System.out.println(x);
   }
}