【Codeforces】[630A]Again Twenty Five!

【Codeforces】[630C]Lucky Numbers

【Codeforces】[638A]Home Numbers

【Codeforces】[651A]Joysticks

【Codeforces】[651B]Beautiful Paintings

【Codeforces】[651C]Watchmen

【Codeforces】[652A]Gabriel and Caterpillar

【Codeforces】[653A]Bear and Three Balls

【Codeforces】[656A]Da Vinci Powers

【Codeforces】[658A]Bear and Reverse Radewoosh