A=1, B=2, C=3, D=4, E=5, F=6
First roll: 1,1,1,1,1 Total =0. Obviously, 1's are worth 0.
2nd roll: 3,2,6,2,4 2B + C + D + F = 2
3rd roll: 1,5,6,5,6 A + 2E + 2F = 8, but A=0 So, 2D + 2E = 8
4th roll: 3,1,3,1,1 3A + 2C = 4. Since A = 0, then, C =2.
Going back to 2nd roll, B, D, F = 0
Going back to 3rd roll, E = 4
Done.
A, B, D, F = 0
C = 2
E = 4.
Then, I said "ohhhh, I get it... that was stupid."
I ran the game 3 times, each time was approximately the same level of difficulty.
Your math stinks if you had trouble mathematically