#!/bin/sh
case $# in
  1) ;;
  *) echo "Usage: $0 <number>\n" 1>&2; exit 1 ;;
esac

exec induce -e 'fibo[0]=0; fibo[1]=1;
fibo[n] = fibo[n-1]+fibo[n-2] if n>1;
fibo[n] = fibo[n+2]-fibo[n+1] if n<0;' -q "fibo[$1]"
