100+8-50+234-34+567-2-2-2-2-2-2-2-2-2-2-2-2-2-2-2-2-2-2-2
=793...................................................
100+8=108 108-50=158 158+234=392 392-34=358 358+567=925 925-2х19=925-38=887 Ответ:887