if a 1 appears in any of three specific columns, then cut row and move to next sheet

[intothewild]

In attached workbook there are 0 and 1's in columns G, H and I.
Any ideas on:

• If a 1 appears in any of these three columns (G, H and I) on Sheet2, then move the row that the 1 (or 1's) are in, from Sheet2 to Sheet3. Would need to determine how many rows are in Sheet3 before pasting in new rows (to avoid overwriting rows that are already in there).