What is the total amount of net tangible assets for PlanGrid and BuildingConnected?
{"Developed technologies": {"Assemble Systems (1)": 4.4, "PlanGrid": 78.0, "BuildingConnected": 12.5, "Total": 94.9}, "Customer relationships and other non-current intangible assets": {"Assemble Systems (1)": 12.0, "PlanGrid": 98.0, "BuildingConnected": 26.9, "Total": 136.9}, "Trade name": {"Assemble Systems (1)": 2.8, "PlanGrid": 20.0, "BuildingConnected": 6.8, "Total": 29.6}, "Goodwill": {"Assemble Systems (1)": 72.0, "PlanGrid": 588.7, "BuildingConnected": 206.3, "Total": 867.0}, "Deferred revenue (current and non-current)": {"Assemble Systems (1)": -1.7, "PlanGrid": -25.5, "BuildingConnected": -2.8, "Total": -30.0}, "Net tangible assets": {"Assemble Systems (1)": 4.1, "PlanGrid": 18.4, "BuildingConnected": 3.5, "Total": 26.0}, "Total": {"Assemble Systems (1)": 93.6, "PlanGrid": 777.6, "BuildingConnected": 253.2, "Total": 1124.4}}
net_tangible_assets_PlanGrid = df["Net tangible assets"]["PlanGrid"]
net_tangible_assets_BuildingConnected = df["Net tangible assets"]["BuildingConnected"]
answer = net_tangible_assets_PlanGrid + net_tangible_assets_BuildingConnected