#include <stdio.h>
#include <math.h>
void main()
{double a=2, S, f1, x=1;
while (x<=3)
{f1=0;
if (x>=a)
{for (int n=0;n<=10;++n)
f1+=pow(x-1,2*n-1)/(2*n+1)/pow(x+1,2*n+1);
f1=2*f1;
S=a*f1; printf("\nz=%f\t",a*log(x));}
else
{for(int n=0;n<=10;++n)
f1+=pow(a-1,2*n-1)/(2*n+1)/pow(a+1,2*n+1);
f1=2*f1;
S=x*f1; printf("\nz=%f\t",x*log(a));}
printf("\nS=%f\n",S);
x+=0.5}
}