1213

const eps = 0.00001;
      x = 1/5;
      x2 = 1/239;
var
   s, s1, s2, next : real;
   i : integer;

begin
   next := 1; s1 := 1;

   i := 2;
   repeat
      next := next * i * sqr(x) / succ(i) / (sqr(x) + 1);
      inc(i, 2);
      s1 := s1 + next;
   until next < eps;
   s1 := s1 * x / (1 + sqr(x));

   next := 1; s2 := 1;

   i := 2;
   repeat
      next := next * i * sqr(x2) / succ(i) / (sqr(x2) + 1);
      inc(i, 2);
      s2 := s2 + next;
   until next < eps;
   s2 := s2 * x2 / (1 + sqr(x2));

   s := (16 * s1) - (4 * s2);
   writeln(s);
end.