El número 1234567890 no se puede agregar repetidamente. La respuesta es 1234567890.

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286 749=1035, 289 746=1035, 289 764=1053, 324 =1089 , 325 764=1089

342 756=1098, 346 752=1098, 347 859=1206, 349 857=1206, 352 746=1098

356 742=1098, 357 849 =1206, 359 847=1206, 364 725=1089, 365 724=1089

423 675=1098, 425 673=1098, 426 879=1305, 429 876=1305, 432 657=1089

437 589=1026, 437 652=1089, 439 587=1026, 452 637=1089, 457 632=1089

473 589=1062, 473 625=1098, 475 623=1098 , 476 829=1305, 479 583=1062

479 826=1305, 483 579=1062, 487 539=1026, 489 537=1026, 489 573=1062

537 489 =1026,539 487=1026,573 489=1062,579 483=1062,583 479=1062

587 439=1026,589 437=1026,589 473=1062,623 475=1098,624 879=1503

625 473=1098, 629 874=1503, 632 457=1089, 637 452=1089, 652 437=1089

657 432=1089, 673 425=1098 , 674 829=1503, 675 423=1098, 679 824=1503

724 365=1089, 725 364=1089, 742 356=1098, 743 859=1602, 746 289=1035

746 352=1098, 749 286=1035, 749 853=1602, 752 346=1098, 753 849=1602

756 342=1098, 759 843=1602, 764 289=1053, 764 325=1089, 765 324=1089

769 284=1053, 784 269=1053, 786 249=1035, 789 246=1035, 789 264=1053

824 679=1503 , 826 479=1305, 829 476=1305, 829 674=1503, 843 759=1602

847 359=1206, 849 357=1206, 849 753=1602, 853 749=1602, 857 49= 1206

859 347=1206, 859 743=1602, 874 629=1503, 876 429=1305, 879 426=1305

879 624=1503