===== Оформление по канонам Turbo Pascal =====
program Turbo;
uses Crt;
var
s, y: real;
i, n: integer;
begin
ClrScr;
s := 0;
n := 20;
for i := 0 to n - 1 do
s := s + Cos(-Pi / 2 + Pi * i / (n - 1));
s := s * Pi / n;
WriteLn('s = ', s:6:3);
ReadKey;
end.
