Problem 1

#!/bin/bash
# Project Euler - Problem 1 - Revised

target=999
sum=0
for ((i=1;i<=$target;i++))
do
        if [ `expr $i % 3` -eq 0 ] || [ `expr $i % 5` -eq 0 ]
        then
                sum=$(($sum + $i))
        fi
done
echo $sum