I have a dataset as below. There are two columns, one is the team ID, the other is the team member ID. I want to create a column to represent the team size. In other words, the number of unique member ID in each team. Does anyone know how to do it?

Code:
cls
clear all
input team member
1    1
1    1
1    1
1    2
1    2
1    2
1    3
1    3
1    3
1    4
1    4
1    4
2    5
2    5
2    6
2    6
2    6
2    7
3    9
3    9
3    10
3    10
end
What I would like to have is:

Code:
input team member size
1    1    4
1    1    4
1    1    4
1    2    4
1    2    4
1    2    4
1    3    4
1    3    4
1    3    4
1    4    4
1    4    4
1    4    4
2    5    3
2    5    3
2    6    3
2    6    3
2    6    3
2    7    3
3    9    2
3    9    2
3    10    2
3    10    2
end