double koef[13];
koef[0] = 1;
koef[1] = (1/3);
koef[2] = (2/15);
koef[3] = (17/315);
koef[4] = (62/2835);
koef[5] = (1382/155925);
koef[6] = (21844/6081075);
koef[7] = (929569/638512875);
koef[8] = (6404582/10854718875);
koef[9] = (443861162/1856156927625);
koef[10] = (18888466084/194896477400625);
koef[11] = (113927491862/49308808782358125);
koef[12] = (58870668456604/3698160658676859375);