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wtsnjp/esum.tex

Created August 15, 2019 02:39
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esum.tex
\catcode`\@=11
\def\esum#1{\the\numexpr\x@esum{#1}\relax}
\def\x@esum#1{%
\ifnum#1<\tw@\z@\else
\expandafter\x@esum\expandafter{\numexpr#1-\tw@\relax}+#1\fi}
\esum{100}\bye
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