M=10;
N=10;
K=7;
L=8;
D=30;
students=[|7,2,8,2|
1,2,2,2|
9,10,10,10|
8,9,7,9|
9,8,10,8|
5,9,6,9|
7,1,8,1|
3,10,2,10|
5,3,5,2|
10,9,10,10|
8,8,8,9|
10,6,10,7|
9,2,10,2|
4,2,4,1|
10,6,10,5|
1,2,1,1|
9,1,8,1|
5,4,5,5|
4,10,4,9|
9,2,9,1|
9,6,9,7|
6,6,6,5|
5,10,6,10|
4,4,5,4|
5,8,5,7|
8,6,9,6|
8,4,9,4|
5,3,6,3|
10,6,9,6|
6,5,6,4|];