There are several marbles in a box (not more than 1000). If you press 2 marbles at a time, or 3 marbles at a time, or 4 marbles at a time, or 5 marbles at a time, or 6 marbles at a time, there will always be left in the box. Next one. If you take out 7 pieces at a time, there will be no one left in the box. What is the maximum number of glass marbles in the box?
一箱玻璃弹珠有若干颗(不多于1000颗)，如果按2颗一次，或3颗一次，或4颗一次，或5颗一次，或6颗一次取出时，最后箱子里总还剩下1颗．如果按7颗一次取出时，箱子里就一颗也不剩．问箱子里原来最多有玻璃弹珠多少颗？
<gadget id="calculator">2 * 3 * 4 * 5 * 6</gadget>
<output>720</output>

<gadget id="calculator">720 + 1</gadget>
<output>721</output>

<result>721</result>