4   1   0   1   2   0   5   2

4 + 1 + 0                     =  5
    1 + 0 + 1                 =  2
        0 + 1 + 2             =  3
            1 + 2 + 0         =  3
                2 + 0 + 5     =  7
                    0 + 5 + 2 =  7
4 +                     5 + 2 = 11
4 + 1 +                     2 =  7