How many four-digit numbers less than 2013 can be formed with the four numbers 2, 0, 1, and 3? (Numbers can be reused)
用2，0，1，3四个数字可以组成多少个小于2013的四位数？(数字可以重复使用)
<gadget id="calculator">1 * 4 * 4 * 4</gadget>
<output>64</output>

<gadget id="calculator">3 + 4 + 64</gadget>
<output>71</output>

<result>71</result>