In a 19-story building, Xiao Ming walks from each floor to the top floor. There are 25 steps when walking to odd-numbered floors, and 26 steps when walking to even-numbered floors. How many steps does Xiao Ming walk when he reaches the 19th floor?
一座19层的楼，小明从每1层步行到顶层，往奇数楼层走时有25级台阶，往偶数楼层走时有26级阶，则小明走到19层时共走了多少级台阶．
<gadget id="calculator">25 + 26</gadget>
<output>51</output>

<gadget id="calculator">19 - 1</gadget>
<output>18</output>

<gadget id="calculator">18 / 2</gadget>
<output>9</output>

<gadget id="calculator">51 * 9</gadget>
<output>459</output>

<result>459</result>