\documentclass{article}12% set font encoding for PDFLaTeX, XeLaTeX, or LuaTeX3\usepackage{ifxetex,ifluatex}4\newif\ifxetexorluatex5\ifxetex6\xetexorluatextrue7\else8\ifluatex9\xetexorluatextrue10\else11\xetexorluatexfalse12\fi13\fi1415\ifxetexorluatex16\usepackage{fontspec}17\else18\usepackage[T1]{fontenc}19\usepackage[utf8]{inputenc}20\usepackage{lmodern}21\fi2223\usepackage{hyperref}2425\usepackage{sagetex}2627\begin{document}28291+4 = $\sage{11+4}$3031\sagestr{"k " * 100}3233\end{document}343536