Rules: Draw a snake of digits in the grid, using digits 1-n (for example 1-5). The snake travels horizontally or vertically, without touching itself even at a point. The clues outside the grid represent the sums of different digit groups in the corresponding directions. If there is more than one number in a clue, there must be at least one empty cell between the digit groups. No digit may be repeated within a row or column. Head and tail of the snake is given in circles. All digits should be on the snake.