\textbf{n} common cubic dice are thrown. What is the probability that the sum of all thrown dice is at least \textbf{x}? \InputFile The input file contains several test cases. Each test case consists two integers \textbf{n} (\textbf{1} ≤ \textbf{n} ≤ \textbf{24}) and \textbf{x} (\textbf{0} ≤ \textbf{x} < \textbf{150}). The meanings of \textbf{n} and \textbf{x} are given in the problem statement. Input is terminated by a case where \textbf{n=0} and \textbf{x=0}. This case should not be processed. \OutputFile For each line of input produce one line of output giving the requested probability as a proper fraction in lowest terms in the format shown in the sample output. All numbers appearing in output are representable in unsigned \textbf{64}-bit integers.