\ProvidesPackage{numending} \def\numending#1#2#3#4{\ifnum#1>100 \numending{\numexpr#1-100\relax}{#2}{#3}{#4}\else \ifnum#1 < 21 \ifnum#1> 4 #4\else\ifnum#1=1 #2 \else#3\fi\fi\else \ifnum#1 < 31 \numending{\numexpr#1-20\relax}{#2}{#3}{#4}\else \numending{\numexpr#1-10\relax}{#2}{#3}{#4}\fi\fi\fi}