# example 1
-1  11  -1   3  25
10  -1   2   0   6
 2  -1  10  -1 -11
 0   3  -1   8  15

# example 2
-1  11  -1   25
10  -1   2    6
 2  -1  10  -11

# timofei
4.3 -12.1 23.2 -14.1 15.5
2.4 -4.4 3.5 5.5 2.5
5.4 8.3 -7.4 -12.7 8.6
6.3 -7.6 1.34 3.7 12.1

# matvei
14.4 -5.3 14.3 -12.7 -14.4
23.4 -14.2 -5.4 2.1 6.6
6.3 -13.2 -6.5 14.3 9.4
5.6 8.8 -6.7 -23.8 7.3