--- a/day1/exercise/collatz.py	Sun Jan 10 23:09:00 2010 +0530
+++ b/day1/exercise/collatz.py	Tue Jan 12 19:03:34 2010 +0530
@@ -1,7 +1,10 @@
-a = -1
-while a > 1:
+a = int( raw_input( 'Enter number: ') )
+while a != 4:
     print a
-    if a % 2:
+    if a % 2 == 1:
         a = a * 3 + 1
     else:
         a /= 2
+print 4
+print 2
+print 1