string of beads is strung together in a circle with 8 red and 2 black beads, a total of 40 beads. A cricket jumps from the second black bead, jumps 6 beads each time and lands on the next bead, how many times must the cricket jump at least before it lands on the black bead again.
一串珠子按照8个红色2个黑色依次串成一圈共40粒．一只蟋蟀从第二个黑珠子开始起跳，每次跳过6个珠子落在下一个珠子上，这只蟋蟀至少要跳多少次，才能又落在黑珠子上．
<result>7</result>