Error: S4cmd : An error occurred (InvalidArgument) when calling the UploadPart operation: Part number must be an integer between 1 and 10000, inclusive

Hi,
I am trying to upload a 560 GB file to s3 bucket and it's failing with below error.

```
[Exception] An error occurred (InvalidArgument) when calling the UploadPart operation: Part number must be an integer between 1 and 10000, inclusive
Exception in thread Thread-13:
Traceback (most recent call last):
File "/usr/lib/python2.7/threading.py", line 801, in __bootstrap_inner
self.run()
File "/usr/local/bin/s4cmd.py", line 542, in run
fail('[Exception] ', exc_info=e)
File "/usr/local/bin/s4cmd.py", line 189, in fail
raise RuntimeError(status)
RuntimeError: 1

[Exception] An error occurred (InvalidArgument) when calling the UploadPart operation: Part number must be an integer between 1 and 10000, inclusive
Exception in thread Thread-17:
Traceback (most recent call last):
File "/usr/lib/python2.7/threading.py", line 801, in __bootstrap_inner
self.run()
File "/usr/local/bin/s4cmd.py", line 542, in run
fail('[Exception] ', exc_info=e)
File "/usr/local/bin/s4cmd.py", line 189, in fail
raise RuntimeError(status)
RuntimeError: 1
```

Start by reading /usr/local/bin/s4cmd.py around line 542 and the failure handling at line 189, then trace how the UploadPart requests and part numbers are produced for a 560 GB file. Reproduce the multipart upload if possible and verify that it completes without AWS's InvalidArgument error.

Written by the indexing model from the issue text.