0399 + 1 = 11420 + 355 = 775(366-365)*775 = 77555:5 + 775 = 786(400 - 399):1 + 786 = 787787:1 - 300 = 487
0399 + 1 = 1
1420 + 355 = 775
(366-365)*775 = 775
55:5 + 775 = 786
(400 - 399):1 + 786 = 787
787:1 - 300 = 487