factorial op

Enter the number : 12
Factorial of 12 is 479001600
Do you want to continue (1/0) : 1

Enter the number : 14
Factorial of 14 is 87178291200
Do you want to continue (1/0) : 1

Enter the number : 0
Factorial of 0 is 1
Do you want to continue (1/0) : 1

Enter the number : 1
Factorial of 1 is 1
Do you want to continue (1/0) : 0

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