What is the total grant date value for all NEOs?
{"Gregory S. Clark(1)": {"FY19 RSU Award Amount (#)(2)": 0, "Grant Date Value ($)": 0}, "Nicholas R. Noviello": {"FY19 RSU Award Amount (#)(2)": 95416, "Grant Date Value ($)": 2106785}, "Amy L. Cappellanti-Wolf": {"FY19 RSU Award Amount (#)(2)": 78620, "Grant Date Value ($)": 1683254}, "Samir Kapuria": {"FY19 RSU Award Amount (#)(2)": 238243, "Grant Date Value ($)": 5100783}, "Scott C. Taylor": {"FY19 RSU Award Amount (#)(2)": 61339, "Grant Date Value ($)": 1354365}}
total_grant_value = df["Gregory S. Clark(1)"]["FY19 RSU Award Amount (#)(2)"]
total_grant_value += df["Nicholas R. Noviello"]["Grant Date Value ($)"]
total_grant_value += df["Amy L. Cappellanti-Wolf"]["Grant Date Value ($)"]
total_grant_value += df["Samir Kapuria"]["Grant Date Value ($)"]
total_grant_value += df["Scott C. Taylor"]["Grant Date Value ($)"]
answer = total_grant_value