How much do the top 3 contractual obligation terms add up to?
{"Convertible senior notes principal": {"1 year": "$-", "> 5 years": 230000, "Total": 352527}, "Convertible senior notes stated interest": {"1 year": 6591, "> 5 years": 6900, "Total": 32887}, "Operating leases": {"1 year": 7565, "> 5 years": 7659, "Total": 40177}, "Purchase obligations": {"1 year": 39390, "> 5 years": "-", "Total": 39390}, "Total contractual obligations": {"1 year": 53546, "> 5 years": 244559, "Total": 464981}}
total_contractual_obligation = df["Convertible senior notes principal"]["Total"] + df["Operating leases"]["Total"] + df["Purchase obligations"]["1 year"]
answer = total_contractual_obligation