n=20;
m=10;
k=3;
tube=[|12,4,10|
19,4,7|
13,3,7|];
X=[3,9,7,3,8,9,7,8,7,4,4,6,3,4,4,9,8,8,3,7];
Y=[5,1,5,6,7,4,1,6,4,6,3,1,1,8,4,2,9,4,6,2];