From Shanghai to Hangzhou, you can take cars, trains and planes. It is known that there are 3 buses, 7 trains, and 2 airplanes in one day. How many different ways are there to travel from Shanghai to Hangzhou?
从上海到杭州，可乘汽车、火车和飞机．已知一天中汽车有3班，火车有7班，飞机有2班，从上海到杭州共有多少种不同的走法？
<gadget id="calculator">3 + 7 + 2</gadget>
<output>12</output>

<result>12</result>