Magnetic Number Ball

It's a puzzle game using No. balls, magnetic like.
Please drag and drop balls, and set by the rules below.

1. First, please complete topmost line freely.
2. Next, do as a no. of top left ball plus a no. of top right ball is a no. of bottom ball.
ex)
　①　②
　　③
　 If a no. of top left ball plus a no. of top right ball is over nine, use the one's digit.
ex)
　⑤　⑥
　　①