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

int main()
{
  int n, k, f=1;
  double K=0.0, x, xx, s = 0.0;

  scanf("%d", &n);
  scanf("%lf", &x);

  xx = 1/(x*x);

  for (k=0; k<=n; k++) {
    K += (double)f/(2*k+1);
    if (f>0) {
      xx *= x*x*x*x;
      s += (K/(2*k+2))*xx;
    }
    f = -f;
  }

  printf("Serie: %g\n", s);
  printf("f(%g) = %g\n", x, .25*atan(x)*log((1+x)/(1-x)));

  return 0;
}