There are 3 direct railways and 4 direct roads from A to B, so how many different ways are there to go from A to B?
从甲地到乙地有3条直达铁路和4条直达公路，那么从甲地到乙地有多少种不同的走法．
<gadget id="calculator">3 + 4</gadget>
<output>7</output>

<result>7</result>