if ($contagiousNumber) {
    For($i = 0; $i -lt $inputFile.Count; $i++){
        if($inputFile[$i] -eq $contagiousNumber){
            continue
        }
        $currentNumber = $inputFile[$i]
        $j = $i + 1
        Do {
            if($currentNumber -eq $contagiousNumber){
                $preamble = $inputFile[$i..($j-1)] | Sort
                $encryptionWeakness = $($preamble[0] + $preamble[-1])
                break
            }
            $currentNumber += $inputFile[$j]
            $j++
        } While ($currentNumber -le $contagiousNumber)
    }
}
Write-Output $encryptionWeakness