Welcome to Codeforces :D

1. http://codeforces.com/problemset/problem/289/A

2. http://codeforces.com/problemset/problem/286/A

3. http://codeforces.com/problemset/problem/279/B

4. http://codeforces.com/problemset/problem/271/B

5. http://codeforces.com/problemset/problem/283/A

6. http://codeforces.com/problemset/problem/288/B

 

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