Count number of divs with same class name in a specific div in jquery

Question

I have following divs

<div class="Main">
    <div class="pipe">
        <div class="mine"></div>
        <div class="mine"></div>
        <div class="mine"></div>
    </div>
    <div class="pipe">
        <div class="mine"></div>
        <div class="mine"></div>
    </div>
</div>

var count = $(.pipe.mine).length;

It counts all divs with class = "mine" and shows count as 5.

 

but I want to only count divs with class = "mine" in upper div not both the divs

Thanks in Advance!!!