SQL Sum all float nodes in XML

I have xml like below:

<float52>7.667000000000000e+003</float52>
<float59>7.667000000000000e+003</float59>
<float60>3.766700000000000e+004</float60>
<ntext2>Other</ntext2>
<nvarchar3>Idea</nvarchar3>
<nvarchar4>Budget</nvarchar4>

I need to sum all the float nodes within this xml. I can extract each float like this:

@xml.value('(/float52/node())[1]','float') as FloatValue

but how can i sum all these float nodes without hard-coding column names?