import java.io.*
class Factorial
{
 public static void main(String args[])
 {
   try
   {
     InputStreamReader in=new InputStreamReader(System.in);
     BufferedReader br= new BufferedReader(in);
     System.out.println("enter the number ");
     int n=Integer.parseInt(br.readLine());
     int f=1;

     while(n>0)
     {
       f=f*n;
       n--;
     }
    System.out.println("the factorial is"+f);
   }
  catch(Exception ex){
    System.out.println("the exception is"+ex);
   }
 }
}