I need help with row numbering

[Xabinav]

CarID	OldCycle	IsRealCycle?	NewCycle (Trying to solve)
1234567	1	1	1
1234567	2	0	1
1234567	3	0	1
1234567	4	1	2
1234567	5	0	2
1234567	6	1	3
1234567	7	1	4

Hello everyone,

I'm trying to develop the field "NewCycle".

The logic is that every time that appears "1"  in the field "IsRealCycle?" , you need to "Jump" at 1 relative to its previous digit.

Another example...

CarID	OldCycle	IsRealCycle?	NewCycle (Trying to solve)
2222333	1	1	1
2222333	2	0	1
2222333	3	0	1
2222333	4	0	1
2222333	5	1	2

Thanks,

[Xabinav]

Thanks Sunny, It's work great !