package dip107;
import java.util.Scanner;
public class Ld2_02_191RDC038
{

    public static void main(String[] args)
    {
        Scanner sc = new Scanner(System.in);
        float x=0;
        double res;
        int i=1;
        double a=1,s=0;
        float k=-1;
        int j=2;
        System.out.println("2.var");
        System.out.println("191RDC038 Niks Veinbergs 1");
        System.out.println("181REB393 Edvards Siliņš 2");
        System.out.println("Vertiba x=");
        if (sc.hasNextFloat())
        {
        x = sc.nextFloat();
        }
        System.out.println("result:");
        if(x>=-2&&x<=-1)
        {   while(Math.abs(a) > 0.001)
            {
                a=k*Math.pow(1+x,j)/i;
                s=a+s;
                i=i+1;
                j=j+2;
                k=-k;
            }
            res=Math.log(1/(2+2*x+x*x));
            System.out.printf("function=%.4f",res);
            System.out.printf("\nsumma=%.4f",s);
        }
        else
        {
            System.out.println("error");
        }

    }
}