Hello, Codeforces! (づ｡◕‿‿◕｡)づ ❤

On 12.02.2022 17:35 (Московское время) we will host Codeforces Global Round 19.

It is the first round of a 2022 series of Codeforces Global Rounds. The rounds are open and rated for everybody.

The presents for this round:

• 30 best participants get a t-shirt.
• 20 t-shirts are randomly distributed among those with ranks between 31 and 500, inclusive.

The presents for the 6-round series in 2022:

• In each round top-100 participants get points according to the table.
• The final result for each participant is equal to the sum of points he gets in the four rounds he placed the highest.
• The best 20 participants over all series get sweatshirts and place certificates.

The problems were written and prepared by Mangooste, TeaTime, __JustMe__ and EvgeniyPonasenkov.

We are very thankful to people, who made this round possible:

• gop2024 for the great coordinating and helping us with preparing probles.
• Our testers: gamegame, dorijanlendvaj, fedoseev.timofey, tfg, fastmath, daubi, Pechalka, Alexdat2000, pakhomovee, Frankenween, philmol, Ultrasanic, tox1c_kid, Viktoriuss and Urvuk3 for their feedback, especially tfg for finding mistakes in the statements.
• MikeMirzayanov for codeforces and polygon platform!
• KAN for his contribution to this round as well.

You will have 2.5 hours to solve 8 problems. And we recommend you to read all the problems!

The score distribution will be announced closer to the start of the round.