prankstar there is still same problem, I modefied little bit for syntax error here is result.
>>> ================================ RESTART ================================
>>>
N: 7
-
2
+
3
-
4
+
5
-
6
+
7
= 3
>>>

I'm not worried for same line but 1 is missing from begining. I am still try to modify if i can get that 1 on begining. Thanks