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On her way to programming school tiger Dasha faced her first test — a huge staircase! The steps were numbered from one to infinity. As we know, tigers are very fond of all striped things, it is

Bomboslav likes to look out of the window in his room and watch lads outside playing famous shell game. The game is played by two persons: operator and player. Operator takes three similar opaque shel

There are n students who have taken part in an olympiad. Now it's time to award the students. Some of them will receive diplomas, some wiil get certificates, and others won't receive anything. Studen

Captain Bill the Hummingbird and his crew recieved an interesting challenge offer. Some stranger gave them a map, potion of teleportation and said that only this potion might help them to reach the tr

B. The number on the board time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Some natural number was written