Monroe is a mechanic and his Form W$-2,$ box $1,$ shows $$21,000$ from his job at Wild Autos. He also works as a waiter on the weekends. His Form W$-2,$ box $1,$ from the restaurant, shows wages of $$8,000$ in box $1.$ He also received $$18$ in tips, which were not reported to his employer. What amount will Monroe report as wages on Form $1040,$ line $1$z$?$