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DS-1000 / 77 / I have a simple dataframe which I would like to bin for every 3 rows.

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Problem:
I have a simple dataframe which I would like to bin for every 3 rows.


It looks like this:


    col1
0      1
1      1
2      4
3      5
4      1
and I would like to turn it into this:


    col1
0      2
1      3
I have already posted a similar question here but I have no Idea how to port the solution to my current use case.


Can you help me out?


Many thanks!




A:
<code>
import pandas as pd


df = pd.DataFrame({'col1':[1, 1, 4, 5, 1]})
</code>
result = ... # put solution in this variable
BEGIN SOLUTION
<code>

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upstream_id / Original problem ID: 77
task_id: 590082e0-adfb-549d-a475-4d01e430d4f0
task_key: default--test--77
task_revision_id: 2
config / split: default / test

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