polycarp fly airplane finally favorite time lunchtime the BerAvia company stewardess give food consecutively passenger 1th Polycarp sit seat m mean mth person foodthe flight menu k dish total Polycarp board flight time count number portion dish board thus know value a1a2ak ai number portion ith dishThe stewardess give food m1 passenger give Polycarp polite smile ask prefer that s Polycarp realize run dish moment for m1 passenger ahead notice dish give besides he s hear strange mumbling m1 passenger ahead similar phrase I m disappoint that happen passenger ask dish stewardess give polite smile say run dish in case passenger need choose dish available if Polycarp hear sound passenger mean passenger choose dish tryhelp polycarp find dish run dish moment Polyarp serve dish definitely available