[pad](https://uiua.org/pad?src=0_17_0-rc_2__IyBhcHByb3hpbWF0ZSBwaSBieSBpbnRlZ3JhdGluZyAxLygxK3jCsikgZnJvbSAwIHRvIDEsCiMgZG9pbmcgc28gaW4gcGFyYWxsZWwgd2l0aCB0aHJlYWRpbmcgZm9yIGEgc3BlZWQtdXAuCgpmIOKGkCDLnMO3MSsx4oG_MgojIGNyZWF0ZSBpbnRlcnZhbCBbYSwgYikgd2l0aCBuIHZhbHVlcwojIGludGVydmFsID8gYSBiIG4Kzrkg4oaQIOKNnC3Dl-KKmeKKmSjDt-KfnOKHoSkKIyBpbnRlZ3JhdGUgZiBvbiBnaXZlbiBpbnRlcnZhbAojIGludGVncmFsID8gZiBhIGIgbgppISDihpAgw7fiioPip7svKyBeMCDOuQojIHRpbWUgYSB1bmFyeSBmdW5jdGlvbgojID8gZgp0ISDihpAg4oqZKCZwIiBtcyImcGbDlzFlM-KMtS0p4oqZbm93XjDiiplub3cKIyBwYXJ0aXRpb24gaW50byBuIHN1YmludGVydmFscwojIFtzdWJpbnRlcnZhbHMgYV9iXSA_IGEgYiBuCnAg4oaQIOKKguKfnChcK-KGr-KkmSjLnMO34oy1LSkpCgpwIDAgMSA0ICMgbj00IHRocmVhZHMK4oqDKCZwICQgc2VxdWVudGlhbDoKICB0ISjip4jigoIvKGkhZuKKmeKKmTFlNykpCnwgJnAgJCBwYXJhbGxlbDoKICB0ISh3YWl04qeI4oKCL3Bvb2woaSFm4oqZ4oqZMWU3KSkKKQomcCAkIGVycm9yOgomcCDijLUtz4DDlzTDt-KKg-Knuy8rIOKXjAo=)

note: this doesn't show any speed-up on the pad because (i assume) there's no
multi-threading available there. run it locally instead.

this toy project estimates pi using threads. it is mostly for me to learn how to
use threads in uiua.