Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_22713796_14 (stage INTEGER, winner VARCHAR, general_classification VARCHAR, team_classification VARCHAR)

### Question ###
Name the most stage for alejandro valverde and astana greg henderson

### Accurate SQL ###

SELECT MAX(stage) FROM table_22713796_14 WHERE general_classification = "Alejandro Valverde" AND team_classification = "Astana" AND winner = "Greg Henderson"