/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
 
	public static Integer factorial(Integer number){
		Integer fact = new Integer(1);
 
 
		Integer i = new Integer(0);
 
		for(i=2;i<=number;i++){
			fact *= i;
		}
 
		return fact;
 
 
	}
	public static void main (String[] args) throws java.lang.Exception
	{
		// your code goes here
 
		System.out.println(factorial(Integer.valueOf(100)));
	}
}

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