#include <stdio.h>
main()
{
	int fact,ctr,num;
	clrscr();
	fact=ctr=1;
	printf("enter a number:");
	scanf("%d",&num);
	if (num>0)
	{
		while (ctr<num)
		{
			fact=fact*ctr;
			ctr++;
		}
		printf("Factorial of %d is %d",num,fact);
	}
	getch();
}