Put several chickens in several cages. If there are 4 chickens in each cage, there will be 1 chicken without a cage; if 5 chickens are placed in each cage, there will be 1 cage without chickens. How many chickens are there at least? ．
将若干只鸡放入若干个笼中，若每个笼中4只，则有1只鸡无笼可放；若每个笼放5只，则有1笼无鸡，则至少有多少只鸡．
<gadget id="calculator">1 + 5</gadget>
<output>6</output>

<gadget id="calculator">5 - 4</gadget>
<output>1</output>

<gadget id="calculator">6 / 1</gadget>
<output>6</output>

<gadget id="calculator">4 * 6</gadget>
<output>24</output>

<gadget id="calculator">24 + 1</gadget>
<output>25</output>

<result>25</result>