factorial

import java.util.Scanner;
public class factorial {

        public static void main(String[] args) {
                // TODO Auto-generated method stub
                Scanner lee = new java.util.Scanner (System.in);
                int suma = 1;
                int ascii1;

                short n = lee.nextShort();



                for(int i=n;i>1;i--){
                suma=suma*i;
                }

                String str1=Integer.toString(suma);
                str1.length();
                String substring1 = str1.substring(0,2);
                String substring2= str1.substring(2,4);
                int num1=Integer.parseInt(substring1);
                int num2=Integer.parseInt(substring2);

               System.out.print((char)num1);
               System.out.print((char)num2);
               System.out.println();