271lonepxp2flbmbz the first digit would be 2 and the last digit 2 as well. Put 'em together, you get 22. Now you have to find that value for each of the 1000 lines provided and add them all together.Index Out of Range error on the line that saysint firstNumber = nums[0]; and I just don't get why. I originally had the code a lot more condensed but I expanded it to debug and that appears to be where the issue is. Naturally I initially thought that nothing was being added to the array, but so far I can't figure out why that would be. I'm going to go and Console.WriteLine nums right now to see if it actually contains anything, but either way I'd appreciate it if someone could help me see what I did wrong here.