Help with adding fans to PC ?

I have a Coolermaster Cosmos S & was going to add 3 120mm fans to the top of the Tower.
The case already has 2 fans,but it's also built to add 3 of these fans to the top & so looking on ebay they all come with the connection cables.
My problem is that I'm not sure my motherboard like most have around 5-6 fan connection slots & so was wondering if you know a way around this like an adapter or something ?

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