I have an object that looks like this:

```
{
  "Boiler Emissions": {
                        "Manhattan": 2.7,
                        "Bronx": 3.2
                      },
  "Benzene Concentration": {
                             "Manhattan": 2.1,
                             "Bronx": 3.5
                           }
}

```

And I want to count the values of `Manhattan` and `Bronx` from both sub objects and get a `result` that looks like this:

```
{
 "Manhattan": 4,8,
 "Bronx": 6,7
}

```

How do I count these nested values?