3.199

//Задание 3.199 Кучеренко

const
    pi: real = 3.14159265359;

Begin
  var y, a, b, x, t: real;

  writeln('Vvedite cherez probel:');
  writeln('a, b, x, t');
  readln(a, b, x, t);

  if x < t then
    y := a * exp(ln(x) * b) + pi
  else
    y := x + sin(exp(ln(x) * a) - b);

  writeln('Y = ', y);
end.