var mul_table = [
  512, 512, 456, 512, 328, 456, 335, 512, 405, 328, 271, 456, 388, 335, 292,
  512, 454, 405, 364, 328, 298, 271, 496, 456, 420, 388, 360, 335, 312, 292,
  273, 512, 482, 454, 428, 405, 383, 364, 345, 328, 312, 298, 284, 271, 259,
  496, 475, 456, 437, 420, 404, 388, 374, 360, 347, 335, 323, 312, 302, 292,