shell script math operation add times etc

#!/bin/bash

count=0

for (( i=36 ; i<=61; i++ ))
do
for (( j=0; j<10; j++))
do
let "count++"
echo $count
let "page=$j * 100"
echo $page
filename="http://www.abc.com/t_${i}_${page}_EN.htm"
echo $filename
wget "$filename" --output-document=html/${count}.html

done
done