The sum of three consecutive natural numbers is 231, what is the smallest of these three numbers?
三个连续自然数的和是231，这三个数中最小的是多少．
<gadget id="calculator">231 / 3</gadget>
<output>77</output>

<gadget id="calculator">77 - 1</gadget>
<output>76</output>

<result>76</result>