A = 360 - 3 + 354 - 9 + 348 -15 + ... - 345 + 12 - 351 + 6 - 357
= (360 - 3) + (354 - 9) + (348 - 15) +....- (345 + 12) - (351 + 6) - 357
= 357 + 345 + 333 +....- 357 - 357 - 357
= (357 + 333) + 345 +....- 357
= 690 + 345 +....- 357
= 1035 x (-357)
= -369495