Need formula for if condition

I am trying to create a formula on a form through checkboxes but am stumped with the multiple conditions:

5 checkboxes
Cell Links to C3-C7

If Cell C3, C4, C5 are True then state in C11 "Great"
If Cell C3, C4, C6 are True then state in C11 "OK"
If Cell C1, C2, C3 are True then state in C11 "Good"

No condition will conflict with any other condition within the cell

If you know the correct formula, please let me know.

Thank you in advance.

Eric