Very Easy
1 x 1
1
5 x 6
30
15 x 15
225
30 x 16
480
93742 x 7253
679910726
5 x 5
25
7 x 9
63
12 x 16
192
43 x 38
1634
857462 x 763
654243506
10 x 5
50
12 x 4
48
13 x 12
156
52 x 64
3328
94852 x 958499
90915547148
10 x 7
70
12 x 11
132
14 x 15
78 x 94
7332
564837 x 300
169451100
10 x 9
90
12 x 12
144
19 x 20
380
32175
3456789035 x 98