Kakurasu #18

Color the gray cells of the grid black or white.
The numbers at the top and left edges of the grid indicate the sum of the values of the black-colored cells in that row or column.
The numbers at the right edge of the grid indicate the values of the cells in each row for the column sums. The numbers at the bottom of the grid indicate the values of the cells in each column for the row sums.

Calculator gives all the valid combinations for a given sum and number of digits. You can also use the combination tables
Short manual