2
__
10
=
9
__
15
=
5
__
20
=
2
_
6
=
4
__
10
=
5
__
15
=
3
_
9
=
6
__
10
=
12
__
15
=
10
__
50
=
12
__
16
=
15
__
20
=
3
__
15
=
6
_
9
=
10
__
20
=
4
__
12
=
4
_
6
=
30
__
40
=
10
__
15
=
8
__
10
=
20
__
50
=
16
__
20
=
5
__
25
=
9
__
12
=
3
__
30
=
5
__
50
=
4
__
20
=
15
__
25
=
10
___
100
=
3
_
6
=
6
_
8
=
40
__
50
=
8
__
12
=
6
__
15
=
2
_
8
=
5
__
10
=
20
__
30
=
8
__
20
=
2
_
4
=
4
__
40
=
2
__
10
=
1
_
5
9
__
15
=
3
_
5
5
__
20
=
1
_
4
2
_
6
=
1
_
3
4
__
10
=
2
_
5
5
__
15
=
1
_
3
3
_
9
=
1
_
3
6
__
10
=
3
_
5
12
__
15
=
4
_
5
10
__
50
=
1
_
5
12
__
16
=
3
_
4
15
__
20
=
3
_
4
3
__
15
=
1
_
5
6
_
9
=
2
_
3
10
__
20
=
1
_
2
4
__
12
=
1
_
3
4
_
6
=
2
_
3
30
__
40
=
3
_
4
10
__
15
=
2
_
3
8
__
10
=
4
_
5
20
__
50
=
2
_
5
16
__
20
=
4
_
5
5
__
25
=
1
_
5
9
__
12
=
3
_
4
3
__
30
=
1
__
10
5
__
50
=
1
__
10
4
__
20
=
1
_
5
15
__
25
=
3
_
5
10
___
100
=
1
__
10
3
_
6
=
1
_
2
6
_
8
=
3
_
4
40
__
50
=
4
_
5
8
__
12
=
2
_
3
6
__
15
=
2
_
5
2
_
8
=
1
_
4
5
__
10
=
1
_
2
20
__
30
=
2
_
3
8
__
20
=
2
_
5
2
_
4
=
1
_
2
4
__
40
=
1
__
10