There is a number that leaves 2 when divided by 3, 3 when divided by 5, 4 when divided by 7, and 5 when divided by 9. How much is this number at least.
有一个数除以3余2，除以5余3，除以7余4，除以9余5．这个数至少是多少．
<gadget id="calculator">21 * 3</gadget>
<output>63</output>

<gadget id="calculator">15 * 4</gadget>
<output>60</output>

<gadget id="calculator">60 - 105</gadget>
<output>-45</output>

<gadget id="calculator">35 + 63 + (-45)</gadget>
<output>53</output>

<gadget id="calculator">53 * 3</gadget>
<output>159</output>

<gadget id="calculator">159 - 1</gadget>
<output>158</output>

<result>158</result>