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B - FarmerJohn is a successful farmer and he would like to expand his business. For this reason he is going to buy a new plot of land to grow even more crops (and earn even more money). Curr

E - Mike and gcd problem Mike has a sequence A = [a1, a2, ..., an] of length n. He considers the sequence B = [b1, b2, ..., bn] beautiful if the gcd of all its elements is bigger t

D - Average Sleep Time It's been almost a week since Polycarp couldn't get rid of insomnia. And as you may already know, one week in Berland lasts k days!When Polycarp went to a doct

D - Okabe and BoxesOkabe and Super Hacker Daru are stacking and removing boxes. There are n boxes numbered from 1 to n. Initially there are no boxes on the stack.Okabe, being a control fre

C - Okabe and Banana Trees Okabe needs bananas for one of his experiments for some strange reason. So he decides to go to the forest and cut banana trees.Consider the point (x, y) in

H - Palindrome NumberA palindrome number is a number that can be read the same way from left to right and from right to left. For example: 961169, 111, 554455 are palindromes,