\SetNlSty{texttt}{[}{]} \SetAlgoNlRelativeSize{0} \SetNlSkip{0em} \nl\KwIn{input data} \nl\KwOut{output data} \nl\tcc{a comment line in C-style} \nl\Repeat{\nl$e<\tau$}{ \nl$f_n\leftarrow Y_1$\; \nl$f_{n+1}\leftarrow f_n\times f_{n-1}$\; \nl$e\leftarrow \frac{f_n}{2}$\; } \nl\KwRet{$e$}