<s>[INST] I am trying to add several integers to a dictionary to store the sum of various integer keys. For example, I have a dictionary that has a key for each day of the week and I am trying to add up the total sum for each day.

I am getting the error: `TypeError: 'int' object is not iterable` because I am not sure how to add values into the dictionary where the key already exists.

Here is an example of my code:

```
sum_dict = {'monday':0, 'tuesday':0, 'wednesday':0, 'thursday':0, 'friday':0, 'saturday':0, 'sunday':0}

for day, values in [('monday', [1, 2, 3]), ('tuesday', [4, 5, 6])]:
    sum_dict[day] = sum(sum_dict[day], values)
```

I am trying to sum up all the values for each day. How can I achieve this?[/INST]