uses crt;
var
s, t, e: real;
n: integer;
begin
clrscr;
write('Введите точность вычислений e=');
readln(e);
s := 0;
n := -3;
t := 1;
while t > e do
begin
n := n + 4;
t := 1 / (n * (n + 2));
s := s + t;
end;
s := s * 8;
writeln('S =', s:0:8);
write('pi=', pi:0:8);
readln
end.