f([ 1, 2, 3, 4, 5, 6, 7, 8, 9,10,
   11,12,13,14,15,16,17,18,19,20,
   21,22,23,24,25,26,27,28,29,30,
   31,32,33,34,35,36,37,38,39,40,
   41,42,43,44,45,46,47,48,49,50,
   51,52,53,54,55,56,57,58,59,60,
   61,62,63,64,65,66,67,68,69,70,
   71,72,73,74,75,76,77,78,79,80 ]).