OK, let's work through this together. We're starting with 128 and we're going to multiply it by 408, which means we add 128 to itself 408 times.
Step 1: 0 + 128 = 128
Step 2: 128 + 128 = 256
Step 3: 256 + 128 = 384
Step 4: 384 + 128 = 512
Step 5: 512 + 128 = 640
Step 6: 640 + 128 = 768
Step 7: 768 + 128 = 896
Step 8: 896 + 128 = 1024
Step 9: 1024 + 128 = 1152
Step 10: 1152 + 128 = 1280
Step 11: 1280 + 128 = 1408
Step 12: 1408 + 128 = 1536
Step 13: 1536 + 128 = 1664
Step 14: 1664 + 128 = 1792
Step 15: 1792 + 128 = 1920
Step 16: 1920 + 128 = 2048
Step 17: 2048 + 128 = 2176
Step 18: 2176 + 128 = 2304
Step 19: 2304 + 128 = 2432
Step 20: 2432 + 128 = 2560
Step 21: 2560 + 128 = 2688
Step 22: 2688 + 128 = 2816
Step 23: 2816 + 128 = 2944
Step 24: 2944 + 128 = 3072
Step 25: 3072 + 128 = 3200
Step 26: 3200 + 128 = 3328
Step 27: 3328 + 128 = 3456
Step 28: 3456 + 128 = 3584
Step 29: 3584 + 128 = 3712
Step 30: 3712 + 128 = 3840
Step 31: 3840 + 128 = 3968
Step 32: 3968 + 128 = 4096
Step 33: 4096 + 128 = 4224
Step 34: 4224 + 128 = 4352
Step 35: 4352 + 128 = 4480
Step 36: 4480 + 128 = 4608
Step 37: 4608 + 128 = 4736
Step 38: 4736 + 128 = 4864
Step 39: 4864 + 128 = 4992
Step 40: 4992 + 128 = 5120
Step 41: 5120 + 128 = 5248
Step 42: 5248 + 128 = 5376
Step 43: 5376 + 128 = 5504
Step 44: 5504 + 128 = 5632
Step 45: 5632 + 128 = 5760
Step 46: 5760 + 128 = 5888
Step 47: 5888 + 128 = 6016
Step 48: 6016 + 128 = 6144
Step 49: 6144 + 128 = 6272
Step 50: 6272 + 128 = 6400
Step 51: 6400 + 128 = 6528
Step 52: 6528 + 128 = 6656
Step 53: 6656 + 128 = 6784
Step 54: 6784 + 128 = 6912
Step 55: 6912 + 128 = 7040
Step 56: 7040 + 128 = 7168
Step 57: 7168 + 128 = 7296
Step 58: 7296 + 128 = 7424
Step 59: 7424 + 128 = 7552
Step 60: 7552 + 128 = 7680
Step 61: 7680 + 128 = 7808
Step 62: 7808 + 128 = 7936
Step 63: 7936 + 128 = 8064
Step 64: 8064 + 128 = 8192
Step 65: 8192 + 128 = 8320
Step 66: 8320 + 128 = 8448
Step 67: 8448 + 128 = 8576
Step 68: 8576 + 128 = 8704
Step 69: 8704 + 128 = 8832
Step 70: 8832 + 128 = 8960
Step 71: 8960 + 128 = 9088
Step 72: 9088 + 128 = 9216
Step 73: 9216 + 128 = 9344
Step 74: 9344 + 128 = 9472
Step 75: 9472 + 128 = 9600
Step 76: 9600 + 128 = 9728
Step 77: 9728 + 128 = 9856
Step 78: 9856 + 128 = 9984
Step 79: 9984 + 128 = 10112
Step 80: 10112 + 128 = 10240
Step 81: 10240 + 128 = 10368
Step 82: 10368 + 128 = 10496
Step 83: 10496 + 128 = 10624
Step 84: 10624 + 128 = 10752
Step 85: 10752 + 128 = 10880
Step 86: 10880 + 128 = 11008
Step 87: 11008 + 128 = 11136
Step 88: 11136 + 128 = 11264
Step 89: 11264 + 128 = 11392
Step 90: 11392 + 128 = 11520
Step 91: 11520 + 128 = 11648
Step 92: 11648 + 128 = 11776
Step 93: 11776 + 128 = 11904
Step 94: 11904 + 128 = 12032
Step 95: 12032 + 128 = 12160
Step 96: 12160 + 128 = 12288
Step 97: 12288 + 128 = 12416
Step 98: 12416 + 128 = 12544
Step 99: 12544 + 128 = 12672
Step 100: 12672 + 128 = 12800
Step 101: 12800 + 128 = 12928
Step 102: 12928 + 128 = 13056
Step 103: 13056 + 128 = 13184
Step 104: 13184 + 128 = 13312
Step 105: 13312 + 128 = 13440
Step 106: 13440 + 128 = 13568
Step 107: 13568 + 128 = 13696
Step 108: 13696 + 128 = 13824
Step 109: 13824 + 128 = 13952
Step 110: 13952 + 128 = 14080
Step 111: 14080 + 128 = 14208
Step 112: 14208 + 128 = 14336
Step 113: 14336 + 128 = 14464
Step 114: 14464 + 128 = 14592
Step 115: 14592 + 128 = 14720
Step 116: 14720 + 128 = 14848
Step 117: 14848 + 128 = 14976
Step 118: 14976 + 128 = 15104
Step 119: 15104 + 128 = 15232
Step 120: 15232 + 128 = 15360
Step 121: 15360 + 128 = 15488
Step 122: 15488 + 128 = 15616
Step 123: 15616 + 128 = 15744
Step 124: 15744 + 128 = 15872
Step 125: 15872 + 128 = 16000
Step 126: 16000 + 128 = 16128
Step 127: 16128 + 128 = 16256
Step 128: 16256 + 128 = 16384
Step 129: 16384 + 128 = 16512
Step 130: 16512 + 128 = 16640
Step 131: 16640 + 128 = 16768
Step 132: 16768 + 128 = 16896
Step 133: 16896 + 128 = 17024
Step 134: 17024 + 128 = 17152
Step 135: 17152 + 128 = 17280
Step 136: 17280 + 128 = 17408
Step 137: 17408 + 128 = 17536
Step 138: 17536 + 128 = 17664
Step 139: 17664 + 128 = 17792
Step 140: 17792 + 128 = 17920
Step 141: 17920 + 128 = 18048
Step 142: 18048 + 128 = 18176
Step 143: 18176 + 128 = 18304
Step 144: 18304 + 128 = 18432
Step 145: 18432 + 128 = 18560
Step 146: 18560 + 128 = 18688
Step 147: 18688 + 128 = 18816
Step 148: 18816 + 128 = 18944
Step 149: 18944 + 128 = 19072
Step 150: 19072 + 128 = 19200
Step 151: 19200 + 128 = 19328
Step 152: 19328 + 128 = 19456
Step 153: 19456 + 128 = 19584
Step 154: 19584 + 128 = 19712
Step 155: 19712 + 128 = 19840
Step 156: 19840 + 128 = 19968
Step 157: 19968 + 128 = 20096
Step 158: 20096 + 128 = 20224
Step 159: 20224 + 128 = 20352
Step 160: 20352 + 128 = 20480
Step 161: 20480 + 128 = 20608
Step 162: 20608 + 128 = 20736
Step 163: 20736 + 128 = 20864
Step 164: 20864 + 128 = 20992
Step 165: 20992 + 128 = 21120
Step 166: 21120 + 128 = 21248
Step 167: 21248 + 128 = 21376
Step 168: 21376 + 128 = 21504
Step 169: 21504 + 128 = 21632
Step 170: 21632 + 128 = 21760
Step 171: 21760 + 128 = 21888
Step 172: 21888 + 128 = 22016
Step 173: 22016 + 128 = 22144
Step 174: 22144 + 128 = 22272
Step 175: 22272 + 128 = 22400
Step 176: 22400 + 128 = 22528
Step 177: 22528 + 128 = 22656
Step 178: 22656 + 128 = 22784
Step 179: 22784 + 128 = 22912
Step 180: 22912 + 128 = 23040
Step 181: 23040 + 128 = 23168
Step 182: 23168 + 128 = 23296
Step 183: 23296 + 128 = 23424
Step 184: 23424 + 128 = 23552
Step 185: 23552 + 128 = 23680
Step 186: 23680 + 128 = 23808
Step 187: 23808 + 128 = 23936
Step 188: 23936 + 128 = 24064
Step 189: 24064 + 128 = 24192
Step 190: 24192 + 128 = 24320
Step 191: 24320 + 128 = 24448
Step 192: 24448 + 128 = 24576
Step 193: 24576 + 128 = 24704
Step 194: 24704 + 128 = 24832
Step 195: 24832 + 128 = 24960
Step 196: 24960 + 128 = 25088
Step 197: 25088 + 128 = 25216
Step 198: 25216 + 128 = 25344
Step 199: 25344 + 128 = 25472
Step 200: 25472 + 128 = 25600
Step 201: 25600 + 128 = 25728
Step 202: 25728 + 128 = 25856
Step 203: 25856 + 128 = 25984
Step 204: 25984 + 128 = 26112
Step 205: 26112 + 128 = 26240
Step 206: 26240 + 128 = 26368
Step 207: 26368 + 128 = 26496
Step 208: 26496 + 128 = 26624
Step 209: 26624 + 128 = 26752
Step 210: 26752 + 128 = 26880
Step 211: 26880 + 128 = 27008
Step 212: 27008 + 128 = 27136
Step 213: 27136 + 128 = 27264
Step 214: 27264 + 128 = 27392
Step 215: 27392 + 128 = 27520
Step 216: 27520 + 128 = 27648
Step 217: 27648 + 128 = 27776
Step 218: 27776 + 128 = 27904
Step 219: 27904 + 128 = 28032
Step 220: 28032 + 128 = 28160
Step 221: 28160 + 128 = 28288
Step 222: 28288 + 128 = 28416
Step 223: 28416 + 128 = 28544
Step 224: 28544 + 128 = 28672
Step 225: 28672 + 128 = 28800
Step 226: 28800 + 128 = 28928
Step 227: 28928 + 128 = 29056
Step 228: 29056 + 128 = 29184
Step 229: 29184 + 128 = 29312
Step 230: 29312 + 128 = 29440
Step 231: 29440 + 128 = 29568
Step 232: 29568 + 128 = 29696
Step 233: 29696 + 128 = 29824
Step 234: 29824 + 128 = 29952
Step 235: 29952 + 128 = 30080
Step 236: 30080 + 128 = 30208
Step 237: 30208 + 128 = 30336
Step 238: 30336 + 128 = 30464
Step 239: 30464 + 128 = 30592
Step 240: 30592 + 128 = 30720
Step 241: 30720 + 128 = 30848
Step 242: 30848 + 128 = 30976
Step 243: 30976 + 128 = 31104
Step 244: 31104 + 128 = 31232
Step 245: 31232 + 128 = 31360
Step 246: 31360 + 128 = 31488
Step 247: 31488 + 128 = 31616
Step 248: 31616 + 128 = 31744
Step 249: 31744 + 128 = 31872
Step 250: 31872 + 128 = 32000
Step 251: 32000 + 128 = 32128
Step 252: 32128 + 128 = 32256
Step 253: 32256 + 128 = 32384
Step 254: 32384 + 128 = 32512
Step 255: 32512 + 128 = 32640
Step 256: 32640 + 128 = 32768
Step 257: 32768 + 128 = 32896
Step 258: 32896 + 128 = 33024
Step 259: 33024 + 128 = 33152
Step 260: 33152 + 128 = 33280
Step 261: 33280 + 128 = 33408
Step 262: 33408 + 128 = 33536
Step 263: 33536 + 128 = 33664
Step 264: 33664 + 128 = 33792
Step 265: 33792 + 128 = 33920
Step 266: 33920 + 128 = 34048
Step 267: 34048 + 128 = 34176
Step 268: 34176 + 128 = 34304
Step 269: 34304 + 128 = 34432
Step 270: 34432 + 128 = 34560
Step 271: 34560 + 128 = 34688
Step 272: 34688 + 128 = 34816
Step 273: 34816 + 128 = 34944
Step 274: 34944 + 128 = 35072
Step 275: 35072 + 128 = 35200
Step 276: 35200 + 128 = 35328
Step 277: 35328 + 128 = 35456
Step 278: 35456 + 128 = 35584
Step 279: 35584 + 128 = 35712
Step 280: 35712 + 128 = 35840
Step 281: 35840 + 128 = 35968
Step 282: 35968 + 128 = 36096
Step 283: 36096 + 128 = 36224
Step 284: 36224 + 128 = 36352
Step 285: 36352 + 128 = 36480
Step 286: 36480 + 128 = 36608
Step 287: 36608 + 128 = 36736
Step 288: 36736 + 128 = 36864
Step 289: 36864 + 128 = 36992
Step 290: 36992 + 128 = 37120
Step 291: 37120 + 128 = 37248
Step 292: 37248 + 128 = 37376
Step 293: 37376 + 128 = 37504
Step 294: 37504 + 128 = 37632
Step 295: 37632 + 128 = 37760
Step 296: 37760 + 128 = 37888
Step 297: 37888 + 128 = 38016
Step 298: 38016 + 128 = 38144
Step 299: 38144 + 128 = 38272
Step 300: 38272 + 128 = 38400
Step 301: 38400 + 128 = 38528
Step 302: 38528 + 128 = 38656
Step 303: 38656 + 128 = 38784
Step 304: 38784 + 128 = 38912
Step 305: 38912 + 128 = 39040
Step 306: 39040 + 128 = 39168
Step 307: 39168 + 128 = 39296
Step 308: 39296 + 128 = 39424
Step 309: 39424 + 128 = 39552
Step 310: 39552 + 128 = 39680
Step 311: 39680 + 128 = 39808
Step 312: 39808 + 128 = 39936
Step 313: 39936 + 128 = 40064
Step 314: 40064 + 128 = 40192
Step 315: 40192 + 128 = 40320
Step 316: 40320 + 128 = 40448
Step 317: 40448 + 128 = 40576
Step 318: 40576 + 128 = 40704
Step 319: 40704 + 128 = 40832
Step 320: 40832 + 128 = 40960
Step 321: 40960 + 128 = 41088
Step 322: 41088 + 128 = 41216
Step 323: 41216 + 128 = 41344
Step 324: 41344 + 128 = 41472
Step 325: 41472 + 128 = 41600
Step 326: 41600 + 128 = 41728
Step 327: 41728 + 128 = 41856
Step 328: 41856 + 128 = 41984
Step 329: 41984 + 128 = 42112
Step 330: 42112 + 128 = 42240
Step 331: 42240 + 128 = 42368
Step 332: 42368 + 128 = 42496
Step 333: 42496 + 128 = 42624
Step 334: 42624 + 128 = 42752
Step 335: 42752 + 128 = 42880
Step 336: 42880 + 128 = 43008
Step 337: 43008 + 128 = 43136
Step 338: 43136 + 128 = 43264
Step 339: 43264 + 128 = 43392
Step 340: 43392 + 128 = 43520
Step 341: 43520 + 128 = 43648
Step 342: 43648 + 128 = 43776
Step 343: 43776 + 128 = 43904
Step 344: 43904 + 128 = 44032
Step 345: 44032 + 128 = 44160
Step 346: 44160 + 128 = 44288
Step 347: 44288 + 128 = 44416
Step 348: 44416 + 128 = 44544
Step 349: 44544 + 128 = 44672
Step 350: 44672 + 128 = 44800
Step 351: 44800 + 128 = 44928
Step 352: 44928 + 128 = 45056
Step 353: 45056 + 128 = 45184
Step 354: 45184 + 128 = 45312
Step 355: 45312 + 128 = 45440
Step 356: 45440 + 128 = 45568
Step 357: 45568 + 128 = 45696
Step 358: 45696 + 128 = 45824
Step 359: 45824 + 128 = 45952
Step 360: 45952 + 128 = 46080
Step 361: 46080 + 128 = 46208
Step 362: 46208 + 128 = 46336
Step 363: 46336 + 128 = 46464
Step 364: 46464 + 128 = 46592
Step 365: 46592 + 128 = 46720
Step 366: 46720 + 128 = 46848
Step 367: 46848 + 128 = 46976
Step 368: 46976 + 128 = 47104
Step 369: 47104 + 128 = 47232
Step 370: 47232 + 128 = 47360
Step 371: 47360 + 128 = 47488
Step 372: 47488 + 128 = 47616
Step 373: 47616 + 128 = 47744
Step 374: 47744 + 128 = 47872
Step 375: 47872 + 128 = 48000
Step 376: 48000 + 128 = 48128
Step 377: 48128 + 128 = 48256
Step 378: 48256 + 128 = 48384
Step 379: 48384 + 128 = 48512
Step 380: 48512 + 128 = 48640
Step 381: 48640 + 128 = 48768
Step 382: 48768 + 128 = 48896
Step 383: 48896 + 128 = 49024
Step 384: 49024 + 128 = 49152
Step 385: 49152 + 128 = 49280
Step 386: 49280 + 128 = 49408
Step 387: 49408 + 128 = 49536
Step 388: 49536 + 128 = 49664
Step 389: 49664 + 128 = 49792
Step 390: 49792 + 128 = 49920
Step 391: 49920 + 128 = 50048
Step 392: 50048 + 128 = 50176
Step 393: 50176 + 128 = 50304
Step 394: 50304 + 128 = 50432
Step 395: 50432 + 128 = 50560
Step 396: 50560 + 128 = 50688
Step 397: 50688 + 128 = 50816
Step 398: 50816 + 128 = 50944
Step 399: 50944 + 128 = 51072
Step 400: 51072 + 128 = 51200
Step 401: 51200 + 128 = 51328
Step 402: 51328 + 128 = 51456
Step 403: 51456 + 128 = 51584
Step 404: 51584 + 128 = 51712
Step 405: 51712 + 128 = 51840
Step 406: 51840 + 128 = 51968
Step 407: 51968 + 128 = 52096
Step 408: 52096 + 128 = 52224

So, 128*408 = 52224