What Can Plus/Minus Get Us?

Logic Level 3

1  2  3  4  5  6  7\Large 1 \ \square \ 2 \ \square \ 3 \ \square \ 4 \ \square \ 5 \ \square \ 6 \ \square \ 7

If we only used +\large \color{#3D99F6}{+} and \large \color{#D61F06}{-} in place of the boxes above, how many distinct values can we obtain?


Inspiration.

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