planks = 6;
plank_width = [3, 11, 11, 4, 2, 7];
pillars = 16;
pillar_height = [4, 1, 3, 1, 2, 2, 3, 1, 4, 3, 3, 4, 1, 4, 1, 4];
pillar_width = [1, 1, 2, 1, 2, 1, 1, 1, 2, 1, 1, 1, 2, 1, 2, 1];
available_width= 20;
available_height= 12;