n=50;
a=[538,3,4,3,4,3,4,3,128,89,90,131,72,79,76,71,84,81,82,73,76,83,74,83,82,71,72,71,74,81,8,3,2,13,14,5,8,1,1,1,1,151,152,169,168,113,118,175,316,618];