Formula to Test if Value is 0 or More

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how can I write a formula to do this:

If A1-A10 is 0 or greater, add 1, if blank leave blank. Something like this: =IF(A1:A10>=0, "ADD 1", "LEAVE BLANK"

For example:

# A B
1 0 1
2
3 7 8
5
6
7 10 11
8
9 11 12
9
10 15 16

THANK YOU IN ADVANCE FOR YOUR HELP!