/* 
*******************************
  Dags. 26.06.2009
  Forritari: Ragnar Geir Brynjólfsson
  Forrit sem skrifar tvíunartölu
  í bitafjölda sem er heilt margfeldi
  af 4.
********************************
*/
using System;
class T203Fv3_8 {
    static string fixlength(string binary) {
    int diff = binary.Length % 4;
    if (diff != 0) {
		diff=4-diff;
		for(int i=0;i<diff;i++) 
			binary="0"+binary;
		return binary;
	} else
	  return binary;
    }
    static void Main() {
      Console.Write("Sláðu inn binary tölu: ");
      String binary = Console.ReadLine();
      binary=fixlength(binary);
      Console.WriteLine("Talan leiðrétt er: " + binary);
    }
}