##### Contest 1918, Problem A

Problem statement time limit per test: 1 second memory limit per test: 256 megabytes input: standard input output: standard output
A brick is a strip of size 1 × k, placed horizontally or vertically, where k can be an arbitrary number that is at least 2 (k ≥ 2).
A brick wall of size n × m is such a way to place several bricks inside a rectangle n × m, that all bricks lie either horizontally or vertically in the cells, do not cross the border of the rectangle, and that each cell of the n × m rectangle belongs to exactly one brick.