N = 13;
M = 13;
R = 6;
C = 8;
a = [|739,972,916,397,304,210,565,180,422,852,210,376,632,
     |588,425,759,637,515,128,742,24,106,587,597,145,721,
     |467,242,10,728,865,657,596,436,212,763,626,773,343,
     |197,246,286,62,603,99,540,410,875,924,970,218,654,
     |635,108,901,45,324,147,406,873,522,9,167,750,10,
     |109,849,808,119,289,795,511,62,250,649,335,611,912,
     |639,283,35,6,558,842,796,636,269,362,105,748,548,
     |925,427,681,126,841,917,71,173,997,654,335,226,401,
     |148,25,92,636,399,735,441,724,323,759,467,698,755,
     |674,933,483,570,403,374,310,411,338,389,483,853,209,
     |782,417,87,302,811,459,922,859,303,267,142,931,247,
     |792,741,565,594,540,440,325,538,425,398,498,155,869,
     |148,458,708,771,418,613,68,388,954,472,903,126,94|];