Help with a simple game's code (LUA)

[Gblo6689]

okay so I've been trying to figure out how to do this for a little while now and I figure you might be able to help

I'm trying to make a simple dice game that I and my fiance enjoy playing for the PSP. My problem is that I need the code to recognize if multiple dice have the same value, and if so the player is awarded extra points.

The awarding of points is easy, however I cannot for the life of me think of an efficient way to tell the program to check if 3 of the 5 dice have the same value...

for instance:
if the player rolls 3 sixes he/she gains 600 points
if the player rolls 3 ones he/she gains 1000 points

I'm assigning values as such:

Dice={}
Dice[1]={RollValue=0}
Dice[2]={RollValue=0}
Dice[3]={RollValue=0}
Dice[4]={RollValue=0}
Dice[5]={RollValue=0}

for a=1,5 do
Dice[a].RollValue=math.random(1,6)
end

This is only an exert of the whole code, however, you get the gist.
I currently have the code recognizing the values of single dice and assigning points according to that.

Any help would be appreciated.