Count Formula, Ignore Counting Duplicates

[Ottsel]

Tried to search around to find a solution for this, but perhaps I'm not phrasing it correctly.

Below is a table of numbers. I want to count each one, but not twice. So, with this example I need the result to give me 11.

Employee List.xlsx
	F
2	101
3	101
4	101
5	101
6	101
7	101
8	101
9	101
10	101
11	101
12	101
13	101
14	101
15	101
16	101
17	101
18	101
19	101
20	101
21	101
22	101
23	112
24	112
25	113
26	113
27	114
28	115
29	115
30	115
31	115
32	115
33	116
34	116
35	117
36	117
37	117
38	117
39	117
40	117
41	118
42	118
43	118
44	118
45	118
46	119
47	119
48	119
49	120
50	120
51	122
Sheet1

 

[Sufiyan97]

Try

=COUNT(UNIQUE(A2:A51))

 

[Ottsel]

Try

=COUNT(UNIQUE(A2:A51))

Unfortunately, didn't work.

 

[Ottsel]

Kept playing around with formulas and go this to do the trick:

=SUM(1/COUNTIF(F2:F51,F2:F51))

 

[AhoyNC]

Maybe another option.
=ROWS(UNIQUE(F2:F51))