var
  firstNumber, secondNumber: real;
begin
  Write('Введите два числа через пробел и нажмите Enter: ');
  Readln(firstNumber, secondNumber);
  
  Writeln(firstNumber, ' + ', secondNumber, ' = ', firstNumber + secondNumber);
  Writeln(firstNumber, ' - ', secondNumber, ' = ', firstNumber - secondNumber);
  Writeln(firstNumber, ' * ', secondNumber, ' = ', firstNumber * secondNumber);
  if secondNumber = 0 then
    Write('Ошибка! Деление на ноль невозможно!')
  else
    Writeln(firstNumber, ' / ', secondNumber, ' = ', firstNumber / secondNumber);
end.