m=18;
n=20;
students=[|0,32,89,70,89,55,71,79,40,10,64,80,30,19,62,67,98,42,8,32|
57,27,22,1,38,89,52,74,43,8,2,65,82,20,67,22,43,22,95,16|
48,25,6,75,86,96,3,85,43,69,93,4,61,53,81,43,84,20,15,34|
22,35,26,28,33,67,19,79,19,45,8,13,51,0,86,68,18,47,82,3|
16,80,0,18,39,22,5,26,65,70,21,92,66,65,14,6,46,46,21,32|
80,35,86,6,67,29,42,71,14,77,55,3,1,14,38,71,82,41,65,12|
5,77,3,67,22,59,40,81,48,63,63,25,45,32,78,83,26,96,18,99|
45,56,31,30,45,47,80,1,7,81,18,1,90,15,71,22,69,44,18,31|
60,16,93,13,17,44,97,98,51,46,42,22,47,72,97,24,52,55,59,25|
100,28,5,14,76,32,41,97,61,32,20,0,2,8,41,52,77,35,22,98|
78,92,68,29,82,33,28,16,5,9,21,13,26,39,59,69,10,42,4,13|
80,34,42,100,44,32,70,15,32,8,83,10,23,73,8,53,7,21,10,52|
14,82,28,24,33,94,59,4,17,73,53,85,31,100,74,74,12,72,38,34|
14,22,53,0,30,95,3,52,79,41,36,81,25,24,67,48,95,44,7,96|
77,90,48,92,45,78,93,95,38,71,4,83,79,64,89,0,76,81,34,66|
1,13,58,4,40,5,24,17,6,65,13,13,76,3,20,8,36,12,60,37|
42,53,87,10,65,42,25,47,41,33,71,69,94,24,12,92,11,71,3,82|
91,90,20,95,44,76,60,34,95,49,40,89,4,45,27,9,34,82,59,0|];