Hello, Codeforces!↵
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I'm glad to invite you to [Codeforces Round #737 (Div. 2)](https://codeforces.net/contests/1557) , which will be held on [Monday, August 9, 2021 at 16:35 UTC+2](https://www.timeanddate.com/worldclock/fixedtime.html?msg=Codeforces+Round+%23737+%28Div.+2%29&iso=20210809T1635&p1=53&ah=2).↵
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This round **rated for the participants with rating lower than 2100**.↵
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You will be given **5 problems** and **2 hours** to solve them.all problems were prepared by me and [user:AhmedEzzatG,2021-08-04].↵
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One of the problems will be **interactive**. So, it is recommended to read the [guide on interactive problems](https://codeforces.net/blog/entry/45307) before the round.↵
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I would like to thank -↵
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1. [user:Aleks5d,2021-08-04], for awesome coordination of our round and suggested one of the problems.↵
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2. [user:Kaneki-kun,2021-08-04] for help us to prepare the problems. [user:compiler_101,2021-08-04] ,[user:Shanks,2021-08-04] ,[user:DeadPillow,2021-08-04] , and [user:Omar_Elawady,2021-08-04] for discussing and testing the problems.↵
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3. [user:MikeMirzayanov,2021-08-04], for the amazing Codeforces and Polygon platforms.↵
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4. **Testers** [user:physics0523,2021-08-04] , [user:BlueDiamond,2021-08-04] , [user:Tlatoani,2021-08-04] ,[user:mahmoudbadawy,2021-08-04] , [user:Andreasyan,2021-08-04] , [user:IsaacMoris,2021-08-04] , [user:Error_404,2021-08-04] , [user:Basilhijaz,2021-08-04] , [user:hu_tao,2021-08-04] , [user:m371,2021-08-04] , [user:Blobo2_Blobo2,2021-08-04] , [user:elizkaveta,2021-08-04] , [user:zetamoo,2021-08-04] , [user:Mohammed_Atef_Hassan,2021-08-04] , [user:tdpencil,2021-08-04] , [user:mcdx9524,2021-08-04] , [user:nGu,2021-08-04] , [user:_Hosam,2021-08-04] , [user:Bakry_,2021-08-05] , [user:N4553R,2021-08-04] , [user:rkm62,2021-08-04] , [user:Hemose,2021-08-06] , [user:Uzumaki_Narutoo,2021-08-06] , and our **VIP** tester [user:1-gon,2021-08-04]. ↵
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The statements are short and I have tried to make the pretests strong. I encourage you to read all the problems.↵
↵
This is our first official round on Codeforces. We are sincerely looking forward to your participation. We hope everyone will enjoy it.↵
↵
Good luck and see you in the standings!↵
↵
**UPD1** I want to thank [user:Aleks5d,2021-08-08] for translating statements into Russian and [user:mouse_wireless,2021-08-08] author of one of tasks
↵
I'm glad to invite you to [Codeforces Round #737 (Div. 2)](https://codeforces.net/contests/1557) , which will be held on [Monday, August 9, 2021 at 16:35 UTC+2](https://www.timeanddate.com/worldclock/fixedtime.html?msg=Codeforces+Round+%23737+%28Div.+2%29&iso=20210809T1635&p1=53&ah=2).↵
↵
This round **rated for the participants with rating lower than 2100**.↵
↵
You will be given **5 problems** and **2 hours** to solve them.all problems were prepared by me and [user:AhmedEzzatG,2021-08-04].↵
↵
One of the problems will be **interactive**. So, it is recommended to read the [guide on interactive problems](https://codeforces.net/blog/entry/45307) before the round.↵
↵
I would like to thank -↵
↵
1. [user:Aleks5d,2021-08-04], for awesome coordination of our round and suggested one of the problems.↵
↵
2. [user:Kaneki-kun,2021-08-04] for help us to prepare the problems. [user:compiler_101,2021-08-04] ,[user:Shanks,2021-08-04] ,[user:DeadPillow,2021-08-04] , and [user:Omar_Elawady,2021-08-04] for discussing and testing the problems.↵
↵
3. [user:MikeMirzayanov,2021-08-04], for the amazing Codeforces and Polygon platforms.↵
↵
4. **Testers** [user:physics0523,2021-08-04] , [user:BlueDiamond,2021-08-04] , [user:Tlatoani,2021-08-04] ,[user:mahmoudbadawy,2021-08-04] , [user:Andreasyan,2021-08-04] , [user:IsaacMoris,2021-08-04] , [user:Error_404,2021-08-04] , [user:Basilhijaz,2021-08-04] , [user:hu_tao,2021-08-04] , [user:m371,2021-08-04] , [user:Blobo2_Blobo2,2021-08-04] , [user:elizkaveta,2021-08-04] , [user:zetamoo,2021-08-04] , [user:Mohammed_Atef_Hassan,2021-08-04] , [user:tdpencil,2021-08-04] , [user:mcdx9524,2021-08-04] , [user:nGu,2021-08-04] , [user:_Hosam,2021-08-04] , [user:Bakry_,2021-08-05] , [user:N4553R,2021-08-04] , [user:rkm62,2021-08-04] , [user:Hemose,2021-08-06] , [user:Uzumaki_Narutoo,2021-08-06] , and our **VIP** tester [user:1-gon,2021-08-04]. ↵
↵
The statements are short and I have tried to make the pretests strong. I encourage you to read all the problems.↵
↵
This is our first official round on Codeforces. We are sincerely looking forward to your participation. We hope everyone will enjoy it.↵
↵
Good luck and see you in the standings!↵
↵
**UPD1** I want to thank [user:Aleks5d,2021-08-08] for translating statements into Russian and [user:mouse_wireless,2021-08-08] author of one of tasks