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\newcount\@temp@inti
\newcount\@temp@intii
\addassoc\@globalenv\+{\@tlabel@func{\@temp@inti0\relax\@arith@plus}}
\def\@arith@plus#1#2#3{%
  \ifx#2\relax
    \let\@next@plus\@@arith@pm@fin
  \else\ifx#2\@tlabel@int
    \advance\@temp@inti#3\relax
    \let\@next@plus\@arith@plus
  \else
    \errmessage{LISP on TeX [integer plus]: Invalid argument}%
  \fi\fi\@next@plus#1}

\addassoc\@globalenv\*{\@tlabel@func{\@temp@inti1\relax\@arith@mul}}
\def\@arith@mul#1#2#3{%
  \ifx#2\relax
    \let\@next@mul\@@arith@pm@fin
  \else\ifx#2\@tlabel@int
    \multiply\@temp@inti#3\relax
    \let\@next@mul\@arith@mul
  \fi\fi\@next@mul#1}

\def\@@arith@pm@fin#1{\expandafter\gdef
  \expandafter#1\expandafter{%
  \expandafter\@tlabel@int\expandafter{\the\@temp@inti}}}

\addassoc\@globalenv\-{\@tlabel@func{\@arith@minus}}
\def\@arith@minus#1#2#3#4#5{%
  \@temp@inti#3\relax
  \ifx#4\relax
    \multiply\@temp@inti-1\relax
    \let\@next@minus\@@arith@pm@fin
  \else\ifx#4\@tlabel@int
    \let\@next@minus\@@arith@minus
  \fi\fi\@next@minus#1#4{#5}}

\def\@@arith@minus#1#2#3{%
  \ifx#2\relax
    \let\@next@minus\@@arith@pm@fin
  \else\ifx#2\@tlabel@int
    \@temp@intii#3\relax % #3 < 0
    \advance\@temp@inti-\@temp@intii\relax
    \let\@next@minus\@@arith@minus
  \fi\fi\@next@minus#1}


\addassoc\@globalenv\/{\@tlabel@func{\@arith@div}}
\def\@arith@div#1#2#3#4#5{%
  \@temp@inti#3\relax
  \ifx#4\relax
    \@temp@intii\@temp@inti\relax
    \@temp@inti1\relax
    \divide\@temp@inti\@temp@intii\relax
    \let\@next@div\@@arith@pm@fin
  \else\ifx#4\@tlabel@int
    \let\@next@div\@@arith@div
  \fi\fi\@next@div#1#4{#5}}

\def\@@arith@div#1#2#3{%
  \ifx#2\relax
    \let\@next@div\@@arith@pm@fin
  \else\ifx#2\@tlabel@int
    \divide\@temp@inti#3\relax
    \let\@next@div\@@arith@div
  \fi\fi\@next@div#1}

\addassoc\@globalenv\mod{\@tlabel@func{\@arith@mod}}
\def\@arith@mod#1\@tlabel@int#2\@tlabel@int#3{%
  \@temp@intii#2\relax
  \divide\@temp@intii#3\relax
  \multiply\@temp@intii#3\relax
  \@temp@inti#2\relax
  \advance\@temp@inti-\@temp@intii
  \@@arith@pm@fin#1}

\addassoc\@globalenv\<{\@tlabel@func{\@arith@lt}}
\def\@arith@lt#1\@tlabel@int#2\@tlabel@int#3{%
  \ifnum#2<#3 \gdef#1{\@tlabel@bool{t}}\else\gdef#1{\@tlabel@bool{f}}\fi}