There is a number, if you add 4, it will be divisible by 4; if you subtract 5, it will be divisible by 5; if you multiply it by 6, it will be divisible by 6; if you divide it by 7, it will be divisible by 7. What is the smallest number?
有一个数，若加上4，就能被4整数；若减去5，就能被5整除；若乘以6，就能被6整除；若除以7，就能被7整除．问这个数最小是多少？
<gadget id="calculator">4 * 5 * 49</gadget>
<output>980</output>

<result>980</result>