This is pdfTeX, Version 3.14159265-2.6-1.40.16 (TeX Live 2015/Debian) (preloaded format=pdflatex 2015.12.28)  27 APR 2016 00:46
entering extended mode
 restricted \write18 enabled.
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**problem-4.tex
(./problem-4.tex
LaTeX2e <2015/01/01>
Babel <3.9l> and hyphenation patterns for 79 languages loaded.
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Document Class: article 2014/09/29 v1.4h Standard LaTeX document class
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File: size10.clo 2014/09/29 v1.4h Standard LaTeX file (size option)
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(/usr/share/texlive/texmf-dist/tex/latex/base/omscmr.fd
File: omscmr.fd 2014/09/29 v2.5h Standard LaTeX font definitions
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Here is how much of TeX's memory you used:
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Output written on problem-4.pdf (1 page, 116440 bytes).
PDF statistics:
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 1 words of extra memory for PDF output out of 10000 (max. 10000000)