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