Without delay, let's solve this. We've got 501 and we will be multiplying it by 77, that is, adding 501 to itself 77 times.
Step 1: 0 + 501 = 501
Step 2: 501 + 501 = 1002
Step 3: 1002 + 501 = 1503
Step 4: 1503 + 501 = 2004
Step 5: 2004 + 501 = 2505
Step 6: 2505 + 501 = 3006
Step 7: 3006 + 501 = 3507
Step 8: 3507 + 501 = 4008
Step 9: 4008 + 501 = 4509
Step 10: 4509 + 501 = 5010
Step 11: 5010 + 501 = 5511
Step 12: 5511 + 501 = 6012
Step 13: 6012 + 501 = 6513
Step 14: 6513 + 501 = 7014
Step 15: 7014 + 501 = 7515
Step 16: 7515 + 501 = 8016
Step 17: 8016 + 501 = 8517
Step 18: 8517 + 501 = 9018
Step 19: 9018 + 501 = 9519
Step 20: 9519 + 501 = 10020
Step 21: 10020 + 501 = 10521
Step 22: 10521 + 501 = 11022
Step 23: 11022 + 501 = 11523
Step 24: 11523 + 501 = 12024
Step 25: 12024 + 501 = 12525
Step 26: 12525 + 501 = 13026
Step 27: 13026 + 501 = 13527
Step 28: 13527 + 501 = 14028
Step 29: 14028 + 501 = 14529
Step 30: 14529 + 501 = 15030
Step 31: 15030 + 501 = 15531
Step 32: 15531 + 501 = 16032
Step 33: 16032 + 501 = 16533
Step 34: 16533 + 501 = 17034
Step 35: 17034 + 501 = 17535
Step 36: 17535 + 501 = 18036
Step 37: 18036 + 501 = 18537
Step 38: 18537 + 501 = 19038
Step 39: 19038 + 501 = 19539
Step 40: 19539 + 501 = 20040
Step 41: 20040 + 501 = 20541
Step 42: 20541 + 501 = 21042
Step 43: 21042 + 501 = 21543
Step 44: 21543 + 501 = 22044
Step 45: 22044 + 501 = 22545
Step 46: 22545 + 501 = 23046
Step 47: 23046 + 501 = 23547
Step 48: 23547 + 501 = 24048
Step 49: 24048 + 501 = 24549
Step 50: 24549 + 501 = 25050
Step 51: 25050 + 501 = 25551
Step 52: 25551 + 501 = 26052
Step 53: 26052 + 501 = 26553
Step 54: 26553 + 501 = 27054
Step 55: 27054 + 501 = 27555
Step 56: 27555 + 501 = 28056
Step 57: 28056 + 501 = 28557
Step 58: 28557 + 501 = 29058
Step 59: 29058 + 501 = 29559
Step 60: 29559 + 501 = 30060
Step 61: 30060 + 501 = 30561
Step 62: 30561 + 501 = 31062
Step 63: 31062 + 501 = 31563
Step 64: 31563 + 501 = 32064
Step 65: 32064 + 501 = 32565
Step 66: 32565 + 501 = 33066
Step 67: 33066 + 501 = 33567
Step 68: 33567 + 501 = 34068
Step 69: 34068 + 501 = 34569
Step 70: 34569 + 501 = 35070
Step 71: 35070 + 501 = 35571
Step 72: 35571 + 501 = 36072
Step 73: 36072 + 501 = 36573
Step 74: 36573 + 501 = 37074
Step 75: 37074 + 501 = 37575
Step 76: 37575 + 501 = 38076
Step 77: 38076 + 501 = 38577

So, 501*77 = 38577