#!/bin/bash

n=10
d=($3-$2)/$n
for (( k=0; k<$n; k++ )); do
    mkdir $k
    for (( i=$2 + $k*$d; i<$2 + ($k + 1)*$d; i++ )); do
        echo "http://vk.com/doc$1_$i" >> $k/.urllist
    done
    cd $k
    wget -qb --cookies=on --load-cookies=$HOME/bin/cookie.txt -U 'Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/29.0.1547.66 Safari/537.36' -i .urllist
    cd ../
done