Codeforces 1430 A. Number of Apartments

Recently a new building with a new layout was constructed in Monocarp’s hometown. According to this new layout, the building consists of three types of apartments: three-room, five-room, and seven-room apartments. It’s also known that each room of each apartment has exactly one window. In other words, a three-room apartment has three windows, a five-room — five windows, and a seven-room — seven windows.

Monocarp went around the building and counted

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