Barney's grocery store initially sold out of all its items, so they had 0 items.
They ordered 4458 items to restock the shelves, so they had 0 + 4458 = 4458 items.
They sold an additional 1561 items that day, so they had 4458 - 1561 = 2897 items left.
Currently, they have 575 items in the storeroom, so they have a total of 2897 + 575 = 3472 items left in the entire store.
#### 3472
The answer is: 3472
Below is a math problem. Provide a detailed, step-by-step solution.

### Problem:
If Barney's grocery store initially sold out of all its items at the beginning of the pandemic and then ordered 4458 items to restock the shelves, sold an additional 1561 items that day, and currently has 575 items in the storeroom, what is the total number of items they have left in the entire store?

### Answer:
