$n=<>;
CORE::say $n>0?"0/1":(1,-1,-9,19,71,-261,-449,3059,1431,-32021,17711,302499,-479609,-2545381,7341471,18112339,-91527049,-89596341,1004866831,-108903421,-9939764889)[-$n]."/1"."0"x(1-$n);