N = 15;
M = 15;
R = 7;
C = 7;
a = [|274,451,468,195,257,998,625,616,853,844,998,77,448,577,517,
     |429,182,618,599,753,128,651,436,889,31,236,477,566,110,685,
     |285,455,581,791,277,882,556,645,560,62,677,27,415,934,590,
     |181,37,905,789,60,421,688,532,597,323,703,759,594,168,575,
     |547,524,506,979,962,225,563,410,692,787,57,821,704,154,110,
     |994,219,499,209,976,344,984,957,379,962,722,816,338,886,324,
     |646,135,219,850,623,311,750,473,894,643,337,297,84,110,333,
     |753,461,480,88,842,361,155,736,151,885,140,601,362,259,27,
     |211,610,623,374,239,820,956,523,387,800,135,413,957,278,593,
     |105,837,361,443,890,669,146,501,841,493,327,255,553,658,86,
     |444,586,15,413,108,156,207,220,737,806,25,317,980,520,269,
     |762,216,30,663,360,400,454,458,579,621,252,86,899,410,707,
     |364,621,379,415,913,4,707,312,282,297,182,474,920,377,726,
     |35,788,406,570,997,900,449,971,604,509,238,393,794,92,256,
     |598,122,744,623,753,105,930,967,630,179,649,228,955,189,735|];