N！

<span style="font-size:14px;">package Factorial;
public class Factorial {
	public static long fac(long n)
	{
		if(n==1||n==0) return 1;
		else return n*fac(n-1);
	}
	public static void main(String[] args)
	{
		System.out.println(fac(11));
	}
}
</span>