468 is the sum of 3 consecutive natural numbers, what is the smallest number among them.
468是3个连续自然数的和，其中最小的数是多少．
<gadget id="calculator">468 / 3</gadget>
<output>156</output>

<gadget id="calculator">156 - 1</gadget>
<output>155</output>

<result>155</result>