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Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today. # Now that we have the while loop set up, it's time to compute the sum! Using the value of counter as an index value,

I have spent a couple of hours on this exercise. What am I overlooking

loops.swift
```let numbers = [2,8,1,16,4,3,9]
var sum = 0
var counter = 0

while counter < numbers.count {
counter += 1
sum = sum + counter
}
``` MOD

Hi Anthony,

The beginning of the `while loop` is fine, but the "inside" is where there are some issues.

• First, the math part needs to come before the increment of the counter.
• Next, the math is not adding the correct values. Right now, the `sum` is just being added to the counter with each iteration. But the challenge wants the value at the index in the array for a particular iteration to be added to the sum. It will be like a running total. The first time around will be 0 + 2 to equal 2. The second iteration should be 2 + 8 to equal 10, and so on. To achieve this, you will use the `counter` as the index value for `numbers`. To drop a hint for you, you will need to use `numbers[counter]` in the math part of the loop.

Give it another go with this in mind. If you're still stuck, just leave a comment here.

Keep Coding! :) 