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곱셈: 2 x 13X7

	3	7
		7
2	5	9

	3	3
		9
2	9	7

	2	7
		5
1	3	5

	4	2
		5
2	1	0

	2	8
		4
1	1	2

	2	7
		5
1	3	5

	2	9
		4
1	1	6

		5	9
			1
		5	9

	5	3
		4
2	1	2

		1	2
			8
		9	6

	9	8
		3
2	9	4

	7	5
		2
1	5	0

		3	4
			2
		6	8

	4	5
		6
2	7	0

	2	7
		4
1	0	8