How can I calculate total amount of global memory?

During cuda programming on my Jetson nano, I executed device query to check how many cuda cores in Jetson.

While looking at how the device query code works, I wondered how to calculate total amount of global memory.

But in device query, total amount of global memory was defined structure member of cudaDeviceProp.

In document here(https://docs.nvidia.com/cuda/cuda-runtime-api/structcudaDeviceProp.html), there is no expression how totalGlobalMem is processed. So I can’t inference that.

I want solution that calculates total amount of global memory.