The fractional unit is (1/6) the smallest false fraction ((())/(())); the largest true fraction is ((())/(())), how many such fractions are there in total unit.
分数单位是(1/6)的最小假分数((())/(()))；最大真分数是((())/(()))，这个分数里一共有多少个这样的分数单位．
<result>5</result>