I need your help please, with a calculation..

Hello,

I would like to request your assistance?
How do I calculate to see how many times a number shows up in a spreadsheet?

1122333 10/18/10
1155689 10/18/10
1100039 10/18/10
1122333 10/25/10
1100039 10/25/10
7785966 10/26/10
0069811 10/27/10
5554687 10/28/10
1100039 11/01/10
1122333 11/02/10

ex. 1100039 showed 3 times
0069811 showed 2 times
1122333 showed 4 times
1155689 showed 1 time


Thank you for your time, kindest regards,

Cathy