Determine the summation of the reciprocals of numbers with length equal to N,in the meanwhile there is a digit K excluded from the numbers.

reference:( http://en.wikipedia.org/wiki/Kempner_series )

For example:

if N = 2 and K = 7

the matrix are as following:

    10    20    30    40    50    60    80    90
    11    21    31    41    51    61    81    91
    12    22    32    42    52    62    82    92
    13    23    33    43    53    63    83    93
    14    24    34    44    54    64    84    94
    15    25    35    45    55    65    85    95
    16    26    36    46    56    66    86    96
    18    28    38    48    58    68    88    98
    19    29    39    49    59    69    89    99

ouput then can be the summation of the reciprocals of above matrix

output = 2.01554407485017

So, give the input N and K, determine the output as mentioned above