문제<\/h2>
Alice likes building toy walls. She has a lot of $1<\/mn>\times<\/mo>2<\/mn><\/mrow>1 \times 2<\/math><\/span><\/span> 1<\/span> <\/span> \times<\/span> <\/span><\/span> <\/span> 2<\/span><\/span><\/span><\/span> bricks and a limited supply of 1<\/mn>\times<\/mo>3<\/mn><\/mrow>1 \times 3<\/math><\/span><\/span> 1<\/span> <\/span> \times<\/span> <\/span><\/span> <\/span> 3<\/span><\/span><\/span><\/span> bricks. Both types of bricks have a height of 1 and can not be rotated.<\/p> Alice is going to build a one unit thick wall of length l<\/mi><\/mrow>l<\/math><\/span><\/span> l<\/span><\/span><\/span><\/span> and height h<\/mi><\/mrow>h<\/math><\/span><\/span> h<\/span><\/span><\/span><\/span> out of these bricks. A wall is$

[이미지 1]<\/span><\/td>	[이미지 2]<\/span><\/td>	[이미지 3]<\/span><\/td> <\/tr>
Good seam placement<\/td>	Bad seam placement<\/td>	Solid $7<\/mn>\times<\/mo>4<\/mn><\/mrow>7 \times 4<\/math><\/span><\/span> 7<\/span> <\/span> \times<\/span> <\/span><\/span> <\/span> 4<\/span><\/span><\/span><\/span> wall<\/td> <\/tr> <\/tbody> <\/table> Help Alice determine the minimum number of 1<\/mn>\times<\/mo>3<\/mn><\/mrow>1 \times 3<\/math><\/span><\/span> 1<\/span> <\/span> \times<\/span> <\/span><\/span> <\/span> 3<\/span><\/span><\/span><\/span> bricks required to build a solid wall of length l<\/mi><\/mrow>l<\/math><\/span><\/span> l<\/span><\/span><\/span><\/span> and height h<\/mi><\/mrow>h<\/math><\/span><\/span> h<\/span><\/span><\/span><\/span>.<\/p>$

Another Brick in the Wall