Conditional Formula

[rival36]

Please help me in this, I want a conditional formula to satisfy this condition in attached Excel Sheet image.
If C5 is greater than zero Put B6=A5, Otherwise Return B6= Value in Cell A Whenever Cell C has number greater than Zero Previously.

						Want This Result
	A	B	C			A	B	C
	54		1			54		2
	1		0			1	54	0
	545		0			545	54	0
	45		0			45	54	0
	5		1			5	54	1
	78		2			78	5	2
	80		0			80	78	0
	4		0			4	78	0
	87		1			87	78	4
	5		0			5	87	0
	4		1			4	87	6

 

[Fluff]

Duplicate Please Help. How to restart running total if given condition is satisfied

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