import java.io.*;

public class AAAA {

    public static void main(String args[]) {
        String str;
        int no, fact;
        fact = 1;

        try {
            BufferedReader obj = new BufferedReader(new InputStreamReader(
                    System.in));
            System.out.print("Enter number whose Factorial is to be found : ");
            System.out.flush();
            str = obj.readLine();
            no = Integer.parseInt(str);

            while (no > 0) {
                fact = fact * no;
                no = no - 1;
            }

            System.out.println("FACTORIAL of a given number is  :  " + fact);
        } catch (Exception e) {
        }
    }
}