There is a number between 700-800, divided by 15, 18 and 24, all of which are not divisible. If you add 1 to this number, it will be divisible by 15, 18 and 24 at the same time. What is this number?
有一个数在700-800之间，用15、18和24去除，都不能整除．如果在这个数上加1，就能同时被15，18和24整除．这个数是多少？
<gadget id="calculator">720 - 1</gadget>
<output>719</output>

<result>719</result>