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You are solving a spreadsheet benchmark task in a real workbook. Objective: Produce the correct final workbook state for the expected answer region. What matters: - Only the values in the expected answer region will be graded. - The workbook is the answer. Instructions: 1. Read the workbook and inspect the relevant data region first. 2. Infer the required result for the provided workbook instance. 3. Write the final value(s) directly into the expected answer region. 4. Do not rely on prose, formulas in your chat response, pseudocode, or VBA as the answer unless the benchmark explicitly requires those to be written into cells. 5. If the natural-language task asks for a general method, formula, or macro, convert that into the concrete result needed for this workbook instance. 6. Keep your final text response short and only summarize the workbook cells you changed. Relevant data region(s): Expected answer region(s): C2:C3 Expected answer sheet(s): Task: How can I create a formula in Excel that will display the sum of two horizontal cells in a third cell, only if both of the first two cells contain a value? Specifically, if there's a calendar date in cell A1 and a number representing days or hours in cell B1, I want the sum to show in cell C1 but only if both A1 and B1 are not empty.