f(\frac{m}{n})=\left\{ \begin{array}{rcl}
(m, n, 1) & \mbox{za} & m>0 \\
(-m, n, 2) & \mbox{za} & m<0 \\
(1, 1, 3) & \mbox{za} & m=0
\end{array}\right., & m \in \mathbb{Z}, & n \in \mathbb{N}