Name the most stage for alejandro valverde and astana greg henderson
CREATE TABLE "riders_jersey_progress_table" (
  "stage" real,
  "winner" text,
  "general_classification" text,
  "mountains_classification" text,
  "sprint_classification" text,
  "team_classification" text
);
SELECT MAX("stage") FROM "riders_jersey_progress_table" WHERE "general_classification"='Alejandro Valverde' AND "team_classification"='Astana' AND "winner"='Greg Henderson';