# Largest product of five consecutive numbers in a 1000 digit number

Haven’t done much Project Euler recently – I’ve been busy studying. So here is an answer to problem eight which asks:

Find the greatest product of five consecutive digits in the 1000-digit number.

It then gives a massive number.

My solution is very quick and dirty and makes use of VB.Net’s happiness with jumping between characters, strings and integers. The Val() function treats a character as a value and to make matters easier still, VB Strings can access characters by position. Knowing this, I just iterated through the string multiplying every five consecutive numbers together.

```Sub Main()
Dim beganAt As Date = Now

Dim hugeNumber As String = _
"73167176531330624919225119674426574742355349194934" _
& "96983520312774506326239578318016984801869478851843" _
& "85861560789112949495459501737958331952853208805511" _
& "12540698747158523863050715693290963295227443043557" _
& "66896648950445244523161731856403098711121722383113" _
& "62229893423380308135336276614282806444486645238749" _
& "30358907296290491560440772390713810515859307960866" _
& "70172427121883998797908792274921901699720888093776" _
& "65727333001053367881220235421809751254540594752243" _
& "52584907711670556013604839586446706324415722155397" _
& "53697817977846174064955149290862569321978468622482" _
& "83972241375657056057490261407972968652414535100474" _
& "82166370484403199890008895243450658541227588666881" _
& "16427171479924442928230863465674813919123162824586" _
& "17866458359124566529476545682848912883142607690042" _
& "24219022671055626321111109370544217506941658960408" _
& "07198403850962455444362981230987879927244284909188" _
& "84580156166097919133875499200524063689912560717606" _
& "05886116467109405077541002256983155200055935729725" _
& "71636269561882670428252483600823257530420752963450"

Dim endAt As Global.System.TimeSpan = Now.Subtract(beganAt)
Dim took As Integer = endAt.Milliseconds

Dim answer As Integer
Dim biggestAnswer As Integer = 0

For index As Integer = 0 To hugeNumber.Length - 5
answer = Val(hugeNumber(index)) _
* Val(hugeNumber(index + 1)) _
* Val(hugeNumber(index + 2)) _
* Val(hugeNumber(index + 3)) _
* Val(hugeNumber(index + 4))
If answer > biggestAnswer Then
biggestAnswer = answer
End If
Next

Console.WriteLine(biggestAnswer.ToString + " in " + took.ToString + "ms.")
Console.ReadKey()
End Sub```

40,824 in 1 ms.