Without delay, let's solve this. We've got 593 and we will be multiplying it by 90, that is, adding 593 to itself 90 times.
Step 1: 0 + 593 = 593
Step 2: 593 + 593 = 1186
Step 3: 1186 + 593 = 1779
Step 4: 1779 + 593 = 2372
Step 5: 2372 + 593 = 2965
Step 6: 2965 + 593 = 3558
Step 7: 3558 + 593 = 4151
Step 8: 4151 + 593 = 4744
Step 9: 4744 + 593 = 5337
Step 10: 5337 + 593 = 5930
Step 11: 5930 + 593 = 6523
Step 12: 6523 + 593 = 7116
Step 13: 7116 + 593 = 7709
Step 14: 7709 + 593 = 8302
Step 15: 8302 + 593 = 8895
Step 16: 8895 + 593 = 9488
Step 17: 9488 + 593 = 10081
Step 18: 10081 + 593 = 10674
Step 19: 10674 + 593 = 11267
Step 20: 11267 + 593 = 11860
Step 21: 11860 + 593 = 12453
Step 22: 12453 + 593 = 13046
Step 23: 13046 + 593 = 13639
Step 24: 13639 + 593 = 14232
Step 25: 14232 + 593 = 14825
Step 26: 14825 + 593 = 15418
Step 27: 15418 + 593 = 16011
Step 28: 16011 + 593 = 16604
Step 29: 16604 + 593 = 17197
Step 30: 17197 + 593 = 17790
Step 31: 17790 + 593 = 18383
Step 32: 18383 + 593 = 18976
Step 33: 18976 + 593 = 19569
Step 34: 19569 + 593 = 20162
Step 35: 20162 + 593 = 20755
Step 36: 20755 + 593 = 21348
Step 37: 21348 + 593 = 21941
Step 38: 21941 + 593 = 22534
Step 39: 22534 + 593 = 23127
Step 40: 23127 + 593 = 23720
Step 41: 23720 + 593 = 24313
Step 42: 24313 + 593 = 24906
Step 43: 24906 + 593 = 25499
Step 44: 25499 + 593 = 26092
Step 45: 26092 + 593 = 26685
Step 46: 26685 + 593 = 27278
Step 47: 27278 + 593 = 27871
Step 48: 27871 + 593 = 28464
Step 49: 28464 + 593 = 29057
Step 50: 29057 + 593 = 29650
Step 51: 29650 + 593 = 30243
Step 52: 30243 + 593 = 30836
Step 53: 30836 + 593 = 31429
Step 54: 31429 + 593 = 32022
Step 55: 32022 + 593 = 32615
Step 56: 32615 + 593 = 33208
Step 57: 33208 + 593 = 33801
Step 58: 33801 + 593 = 34394
Step 59: 34394 + 593 = 34987
Step 60: 34987 + 593 = 35580
Step 61: 35580 + 593 = 36173
Step 62: 36173 + 593 = 36766
Step 63: 36766 + 593 = 37359
Step 64: 37359 + 593 = 37952
Step 65: 37952 + 593 = 38545
Step 66: 38545 + 593 = 39138
Step 67: 39138 + 593 = 39731
Step 68: 39731 + 593 = 40324
Step 69: 40324 + 593 = 40917
Step 70: 40917 + 593 = 41510
Step 71: 41510 + 593 = 42103
Step 72: 42103 + 593 = 42696
Step 73: 42696 + 593 = 43289
Step 74: 43289 + 593 = 43882
Step 75: 43882 + 593 = 44475
Step 76: 44475 + 593 = 45068
Step 77: 45068 + 593 = 45661
Step 78: 45661 + 593 = 46254
Step 79: 46254 + 593 = 46847
Step 80: 46847 + 593 = 47440
Step 81: 47440 + 593 = 48033
Step 82: 48033 + 593 = 48626
Step 83: 48626 + 593 = 49219
Step 84: 49219 + 593 = 49812
Step 85: 49812 + 593 = 50405
Step 86: 50405 + 593 = 50998
Step 87: 50998 + 593 = 51591
Step 88: 51591 + 593 = 52184
Step 89: 52184 + 593 = 52777
Step 90: 52777 + 593 = 53370

So, 593*90 = 53370