Xiao Hua and Xiao Bi compete in a stair climbing competition. When Xiao Hua reaches the second floor, Xiao Bi has already reached the third floor. When Xiao Hua reaches the third floor, how many floors has Xiao Bi reached?
小华和小碧进行爬楼梯比赛，小华走到2楼时，小碧已走到3楼，当小华走到3楼时，小碧已走到多少楼．
<gadget id="calculator">3 - 1</gadget>
<output>2</output>

<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">4 + 1</gadget>
<output>5</output>

<result>5</result>