Joan has 9 blue balloons.  Sally gave 5 blue balloons to Joan.  Joan then gave 2 blue balloons to Jessica. Joan has _____ blue balloons now.
joan_have=9
sally_gives_joan=5
joan_gave_jassica=2
joan_has_now=(joan_have+sally_gives_joan)-joan_gave_jassica
print(joan_has_now)