Dealing with long integers in pascal

Is there a way in pascal to have a variable that is  atleast 13 digits long? I have a code but can't not get the right results because of the length. I manage to get the right answer in python though. My code is listed below
program factorial;
uses sysutils;
function factorial(num : Integer) : Cardinal;
	if num <= 1 then
		factorial := 1
		factorial := num * factorial(num - 1);
	total : Cardinal;
	index : Integer;
	total := 0;
	index := 0;
		for index := 1 to 15 do
			total := total + factorial(index);

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codecaineAuthor Commented:
Never mind I figured out the solution. I could use int64 :)

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