#!/bin/bash


read-p "what is P's value. " P

for ((i=0;i<=$P:i+=1));do F[i]=1;done
F=$(1)
n=P
while (($F[n]<1000))
    do $F[n+1]=$(($F[n-1]+$F[n-P-1]))
    n=$((n+1))
done