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Adding Values in Panel Data

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Hi, I have a problem in Stata and I hope that somebody can help me.

My panel dataset looks the following:
Code:
Date       ID     Input1 Input2
13880     4        1         .
13880     5        1         .
13880     6         .         .
13880     7        1         1
13880     8         .          .
13880     9         .          .
13880    10        .         1
13880    32        .          .
13880    33    8000    4500
I want to create a new variable that sums up the value of id==33 everytime the id has a 1.
For example:
Code:
Date     ID        Sum(Variable I would like to create)
13880   4            8000
13880   7           12500
13880   8             0
I tried a foreach loop, but I did not figure out how correctly reference to the id==33 data. I know it would be easier if I would run the id==33 as a seperate variable, but since I have multiple Input parameters it becomes a mess to have once a code variable that identifies whether the input is relevant for the id and the value of the input parameter in the second variable itself (I have about 100 Input variables).

I hope somebody can help me.

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