Codeforces 141C: Accepted
Codeforces 143C: Accepted
Codeforces 144C: Accepted
Codeforces 146C: Accepted
Codeforces 148C: Accepted
Codeforces 149C: Accepted
Codeforces 151C: Accepted
Codeforces 152C: Accepted
Codeforces 155C: Accepted
Codeforces 157C: Accepted
Codeforces 160C: Accepted
Codeforces 165C: Accepted
Codeforces 166C: Accepted
Codeforces 168C: Accepted
Codeforces 175C: Accepted
Codeforces 180E: Accepted
Codeforces 182E: Accepted
Codeforces 186C: Accepted
Codeforces 189C: Accepted
Codeforces 190C: Accepted