matrix := [
[2,6,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
[0,0,7,0,0,0,0,0,0,0,0,0,0,0,0,0],
[0,0,0,0,7,0,0,0,0,0,0,0,0,0,0,0],
[0,0,0,0,0,7,0,0,0,0,0,0,0,0,0,0],
[4,7,5,0,11,0,0,0,0,0,0,0,0,0,0,0],
[0,0,0,0,0,0,0,0,7,0,0,0,0,0,0,0],
[0,0,0,0,0,0,0,0,0,7,0,0,0,0,0,0],
[0,0,0,0,0,0,0,0,0,0,7,0,0,0,0,0],
[0,0,0,0,0,0,0,0,0,0,0,0,7,0,0,0],
[0,0,0,0,0,0,0,0,0,0,0,0,0,0,7,0],
[8,9,6,9,5,2,8,8,5,12,12,9,5,0,10,4],
[8,3,12,12,8,4,10,3,12,1,6,11,9,10,8,9],
[0,0,0,7,0,0,0,0,0,0,0,0,0,0,0,0],
[2,2,10,5,4,9,3,11,5,6,8,3,5,5,12,10],
[11,9,9,5,1,6,12,12,8,2,8,0,3,2,8,0],
[5,6,0,6,3,12,7,1,3,5,2,3,1,12,10,4]
]*Z(13);