How can I get the length of a sequence using script

I am trying to get the length of an image sequence that was imported using importOptions.sequence.  I need to check that the length is a correct number, and if it is too short/long it gives an error message.
Is there a way to do this?
Thanks

//Assumes that your clip is the first item in your project
var a = app.project.item(1).duration;     //Returns clip length in seconds
var b = app.project.item(1).frameDuration     //Returns a single frame length in seconds
var c = a/b;     //If you divide the clip duration by the frameDuration, you should get clip length in frames

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