Berland traffic different traffic country the capital Berland consist n junction m road each road connect pair junction there multiple road pair junction for road know capacity value ci maximum number car drive road direction unit time for road car drive direction that car can not simultaneously direction a road traffic number car go unit time for road aibi value negative traffic move bi ai a road traffic noninteger numberThe capital special junction entrance city junction 1 exit city junction n for junction true traffic lose that junction 1 n incoming traffic sum equal outgoing traffic sumtraffic unusual peculiarity capital Berland pair junction xy sum traffic path x y do not change depend choice path such sum include traffic road path possible minus sign traffic road direct direction road path x yyour task find large traffic pass trough city unit time correspond traffic road