import java.io.*;
class Factorial 
{
    public static void main(String Arg[ ]) throws IOException
    {
        int num;
         
        BufferedReader in = new BufferedReader(new 
            InputStreamReader(System.in));

        System.out.print("Ingrese numero : ");
        num = Integer.parseInt(in.readLine( ));
        
        long fact = 1;
        
        for(int i = 2; i <= num; i++)
        	fact *= i; 
        
		System.out.println(num + "! : " + fact);
    }
}