Smart Switch - Too many wires

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My problem is I dont have enough black wires from the house to connect to my new switch. 2 coming from my new switch and 1 coming from the house. Can I just connect all three blacks together or is there another solution.

they may have dead ended your switch box.
take a picture of the wires in there for us.
a dead end switch uses the white wire as a black, since regular three way switches only need to hot black wires and a ground, the nuetrals are just wire nutted together.

so basically you would have to get another smart switch that does not have a background light, which requires a white neutral wire. Then you would have to get this master and slave smart switch, since you have two switches controlling the same light/lights