Java - For Statement

import java.io.*;

class ssvfor
 {
   public static void main(String arg[]) throws IOException
    {
      System.out.print("\nEnter the Number :  ");

      DataInputStream dr = new DataInputStream(System.in);

      String t;

      t = dr.readLine();

      int i,n,f;
      f=1;

      n = Integer.parseInt(t);

        for(i=1;i<=n;i++)
         {
            f = f*i;
          }
          System.out.println("\nFactorail of Given number "+n+" is : "+f);

   }
 }