How to use For Each execution in OSB

hi all,
I'm confused about the 'For Each' action in OSB. Now, I have a variable('max') which equals to 3 , and I wanna to use For Each action to perform a loop execution, something like for(1 to 3)--
The code is like below:
For Each variable 'value' of variable 'max' ,
Do{
Assign value to variable tempMsg;
Service Callout to PS with tempMsg
What I think is the 'value' should be increased from 1 to 3 itself, and the service callout should be performed by 3 times with '1', '2', '3'. However, it's not, the service callout action was performed once with the value of 3, just like the 1 and 2 were overwritten.
Any idea?

Using 'For Each' activity in OSB
Thanks,
Vijay

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