【Codeforces】[659A]Round House

【Codeforces】[659C]Tanya and Toys

【Codeforces】[667A]Pouring Rain

【Codeforces】[669A]Little Artem and Presents

【Codeforces】[66A]Petya and Java

【Codeforces】[66B]Petya and Countryside

【Codeforces】[670D2]D2. Magic Powder - 2

【Codeforces】[673A]Bear and Game

【Codeforces】[673B]Problems for Round

【Codeforces】[675A]Infinite Sequence