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\usepackage[T2A]{fontenc}  \usepackage[utf8]{inputenc}  \usepackage[english, russian]{babel}  \usepackage{pscyr}   \section{\text{1.Алгоритм Калмана}}  \textit{Oh, an empty article!}  You can get started by \textbf{double clicking} this text block and begin editing. You can also click the \textbf{Text} button below to add new block elements. Or you can \textbf{drag and drop an image} right onto this text. Happy writing!