Barney's grocery store started with 0 items + 4458 they ordered = <<0+4458=4458>>4458 items total.
That day they sold 1561 items, so 4458 total - 1561 sold = <<4458-1561=2897>>2897 items.
If there are 575 items in the storeroom, then there are 575 + 2897 = <<575+2897=3472>>3472 items in the whole store.
#### 3,472