Program Second;
var x, t, y: real;
begin
  write('Ââåäèòå X è T: ');
  readln(x, t);
  
  if x < 0.5 then
    y := exp(ln(sin(x) / cos(x)) * 3) + sqr(x)
  else if x = 0.5 then
    y := sqrt(x + t) + 1 / t
  else if x > 0.5 then
    y := cos(x) + t * sin(x);
  writeln('Y = ', y);
end.