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Ilya lives in a beautiful city of Chordalsk. There arennhouses on the street Ilya lives, they are numerated from11tonnfrom left to right; the distance between every two neighboring houses is eq...

It's time polar bears Menshykov and Uslada from the zoo of St. Petersburg and elephant Horace from the zoo of Kiev got down to business. In total, there arentasks for the day and each animal should d...

Imagine a city withnhorizontal streets crossingmvertical streets, forming an(n - 1) × (m - 1)grid. In order to increase the traffic flow, mayor of the city has decided to make each street one wa...

A positive integerxxis called apower of twoif it can be represented asx=2^y , whereyyis a non-negative integer. So, thepowers of twoare1,2,4,8,16,…1,2,4,8,16,…. You are given two positive i...

Pasha has many hamsters and he makes them work out. Today,nhamsters (nis even) came to work out. The hamsters lined up and each hamster either sat down or stood up. For another exercise, Pasha nee...

A group ofnschoolboys decided to ride bikes. As nobody of them has a bike, the boys need to rent them. The renting site offered themmbikes. The renting price is different for different bikes, ren...