What is the average value per share that Robert Andersen acquired on vesting?
{"Jon Kirchner": {"Number of Shares Acquired on Exercise (#)": "\u2014", "Value Realized on Exercise ($)": "\u2014", "Number of Shares Acquired on Vesting (#)": 153090, "Value Realized on Vesting ($)": 3428285}, "Robert Andersen": {"Number of Shares Acquired on Exercise (#)": "\u2014", "Value Realized on Exercise ($)": "\u2014", "Number of Shares Acquired on Vesting (#)": 24500, "Value Realized on Vesting ($)": 578806}, "Paul Davis": {"Number of Shares Acquired on Exercise (#)": "\u2014", "Value Realized on Exercise ($)": "\u2014", "Number of Shares Acquired on Vesting (#)": 20500, "Value Realized on Vesting ($)": 482680}, "Murali Dharan": {"Number of Shares Acquired on Exercise (#)": "\u2014", "Value Realized on Exercise ($)": "\u2014", "Number of Shares Acquired on Vesting (#)": 15000, "Value Realized on Vesting ($)": 330120}, "Geir Skaaden": {"Number of Shares Acquired on Exercise (#)": "\u2014", "Value Realized on Exercise ($)": "\u2014", "Number of Shares Acquired on Vesting (#)": 21100, "Value Realized on Vesting ($)": 500804}}
rober_value = df["Robert Andersen"]["Value Realized on Vesting ($)"]
rober_shares = df["Robert Andersen"]["Number of Shares Acquired on Vesting (#)"]
answer = rober_value / rober_shares