1n_res = 5;
2n_events = 22;
3n_prec = 50;
4source = 1;
5sink = 22;
6min_lvl = [0, -4, -1, -8, -8];
7max_lvl = [5, 2, 6, 1, -2];
8rr = [| 0, -1, 0, 0, 0, -1, -2, 0, 1, 2, 1, 0, 0, 0, 0, -1, 2, 2, 1, 0, 1, 0
9      | 0, 0, 0, 2, 2, 0, 0, -1, 0, -1, 2, -2, 2, -1, -2, -1, -1, -1, 2, 1, -2, 0
10      | 0, 0, 0, 1, 0, -1, 2, 1, 1, 2, -2, 0, 0, 0, 0, 1, -1, 0, 1, 0, 0, 0
11      | 0, -1, -1, 2, -1, 0, -1, -2, 0, -2, 1, 1, 0, 1, 0, 0, -1, -2, 0, -2, 0, 0
12      | 0, -1, 1, 0, 0, -2, -1, -2, 0, 0, -2, -2, -1, 0, 0, 0, 2, 0, 0, 0, 0, 0 |];
13prec = [| 1, 0, 2
14        | 1, 0, 3
15        | 2, 0, 18
16        | 3, 0, 4
17        | 3, 0, 11
18        | 4, 0, 14
19        | 4, 1, 8
20        | 5, 6, 12
21        | 5, 5, 13
22        | 6, 13, 18
23        | 6, -33, 16
24        | 6, 2, 5
25        | 7, 0, 15
26        | 7, 0, 16
27        | 8, -67, 3
28        | 8, -46, 14
29        | 8, 6, 20
30        | 8, 12, 16
31        | 8, -46, 9
32        | 8, -40, 10
33        | 8, -49, 4
34        | 9, -59, 11
35        | 9, 0, 8
36        | 10, 22, 12
37        | 10, -20, 4
38        | 10, 19, 9
39        | 10, 5, 17
40        | 11, -50, 3
41        | 11, 6, 7
42        | 12, 3, 20
43        | 13, 16, 12
44        | 13, 0, 20
45        | 14, 9, 17
46        | 14, 0, 21
47        | 14, 5, 10
48        | 14, 5, 20
49        | 15, 13, 4
50        | 16, 21, 12
51        | 16, 16, 5
52        | 16, 19, 17
53        | 16, 13, 6
54        | 17, -35, 16
55        | 17, -48, 6
56        | 17, 15, 19
57        | 18, -50, 16
58        | 18, 0, 17
59        | 19, 9, 22
60        | 19, -52, 2
61        | 20, 2, 22
62        | 21, 5, 22 |];
63