Hidden File!

2	4	1	1	3	1	1	3	1	1
3	5	3	1	2	1	2	1	2	1	2	1
1	1	1	1	1	1	1	1	1	1	1	1
3	5	1	4	2	1

If the result of the hidden expression above is 70, find the numbers of empty row and enter as answer.

Clue : Title of the puzzle.