N = 16;
M = 16;
R = 9;
C = 9;
a = [|686,785,925,25,729,391,508,647,375,899,62,566,41,534,256,529,
     |831,467,908,924,447,545,61,271,944,990,434,18,827,882,381,248,
     |188,10,275,455,158,598,286,783,293,861,402,648,720,608,206,377,
     |934,908,172,702,959,203,842,578,823,493,721,949,127,587,413,936,
     |829,597,214,727,325,348,71,453,255,514,430,711,35,41,723,969,
     |619,402,660,510,200,303,408,175,423,683,259,265,332,712,153,115,
     |360,480,966,664,96,632,934,331,670,290,416,432,140,107,256,387,
     |446,301,117,379,495,445,776,438,111,719,687,771,443,216,841,652,
     |845,125,491,507,566,730,602,726,793,382,833,518,114,221,141,812,
     |519,485,719,365,638,749,83,616,263,899,847,69,851,509,373,817,
     |893,363,252,591,456,835,388,129,657,116,425,695,198,319,834,839,
     |951,202,450,549,580,15,582,133,568,582,385,247,412,518,765,290,
     |959,857,450,509,948,353,724,362,605,421,672,947,327,785,910,465,
     |469,533,262,499,737,260,420,820,25,191,614,488,911,83,384,624,
     |507,105,789,876,156,677,697,729,293,753,789,820,901,915,531,333,
     |809,924,306,878,382,250,324,846,946,288,886,161,58,28,719,547|];