Updating the Math class: passing a number to the constructor

It is required to modify the Math class so that when it is instantiated, a single integer value is passed to its constructor. After that, all methods of the class should work with this value without needing to specify the argument each time.

class Math
{
    private $value;

    public function __construct(int $value)
    {
        $this->value = $value;
    }

    public function factorial(): int
    {
        if ($this->value < 0) {
            throw new Exception("value less 0");
        }

        $resultNum = 1;

        for($i = 1; $i <= $this->value; $i++)
        {
            $resultNum *= $i;
        }

        return $resultNum;
    }
}

$math = new Math(5);

try {
    echo $math->factorial();
} catch (Exception $e) {
    echo $e->getMessage();
}