In a box of mooncakes, there is 1 left in a box of 3, 1 left in a box of 4, and 1 left in a box of 5, at least how many mooncakes are there in this box.
一箱月饼，3个装一盒剩1个，4个装一盒剩1个，5个装一盒还是剩1个，这箱月饼至少有多少个．
<gadget id="calculator">3 * 4 * 5</gadget>
<output>60</output>

<gadget id="calculator">60 + 1</gadget>
<output>61</output>

<result>61</result>