Kata

Have you heard of the game "electrons around the cores"? I'm not allowed to give you the complete rules of the game, just so much:

• the game is played with 4 to 6 dice, so you get an array of 4 to 6 numbers, each 1-6
• the name of the game is important
• you have to return the correct number five times in a row and your solution is considered to be correct

If you just press "submit", you'll get an array and the expected value!

Here are some input/output pairs for you to wrap your mind around:

• [ 1, 2, 3, 4, 5 ] -> 6
• [ 2, 2, 3, 3 ] -> 4
• [ 6, 6, 4, 4, 1, 3 ] -> 2
• [ 3, 5, 3, 5, 4, 2 ] -> 12

And yes, it is a shameless copy of a famous game.