( "D1@1" < 400)*400+("D1@1"   >= 400 AND "D1@1" < 800)*800+("D1@1" >= 800 AND "D1@1" < 1200)*1200+("D1@1" >= 1200 AND "D1@1" < 1600)*1600+("D1@1" >=  1600)*4000