There are some real fractions between 0 and 1. The numerators and denominators of these real fractions are relatively prime, and the product of the numerator and the denominator is 78. How many such real fractions are there?
在0与1之间有一些真分数，这些真分数的分子与分母是互质的，且分子与分母的乘积都是78，这样的真分数有多少个．
<result>4</result>