1. The problem is to perform the addition of two numbers. 2. The formula for addition is simply $a + b = c$, where $a$ and $b$ are the numbers to add, and $c$ is the sum. 3. Since the user only wrote "ADD" without specifying numbers, let's assume an example: add 3 and 5. 4. Using the formula: $$3 + 5 = 8$$ 5. Therefore, the sum of 3 and 5 is 8.