Need this vbs script to work, keep getting error

#!/bin/bashecho "Please enter your first number: "read aecho "Second number: "read becho "Third number: "read cecho "Fourth number: "read decho "Fifth number: "read esum=$(($a + $b + $c + $d + $e))avg=$(echo $sum / 5 | bc -l ) prod=$(($a * $b * $c * $d * $e))echo "The sum of these numbers is: " $sumecho "The average of these numbers is: " $avgecho "The product of these numbers is: " $prod