FastInt.java

import java.io.*;

public class FastInt {
   final static int BUFFER_SIZE = 65_536;
   final static DataInputStream inp =
      new DataInputStream (new BufferedInputStream (System.in, BUFFER_SIZE));

   // Client call hasNext
   public static boolean hasNextInt () throws IOException {
      fill();
      return hasInt;
   }

   public static int nextInt () throws IOException {
      hasInt = false;
      return n;
   }
   
   private static boolean eof = false;
   private static boolean hasInt = false;
   private static int n = 0;

   private static void fill () throws IOException {
      if (eof) return;
      try {
         byte b;
         // Skip white space
         while ((b=inp.readByte())<=((byte)0x20)) /**/ ;
         n = 0;
         for (;;) {
            hasInt = true;
            n *= 10;
            n += (b - '0');
            b = inp.readByte();
            if (b<=0x20) break;
         }
      } catch (EOFException ex) {
         eof = true;
         close();
      }
   }

   private static void close () {
   }

   public static void main (String[] args) throws IOException {
      while (FastInt.hasNextInt()) {
         System.out.println (FastInt.nextInt());
      }
   }
}