On the Subject of Addition

This is literally just addition. I have no idea why anybody thought that this would be fun, challenging, or interesting to put on a bomb.

Compute the sum on the display and enter it using the numbered buttons to solve the module. Use the grey ‘A’ button to cycle through 10 numbers, the red ‘C’ button to clear your input, and the ‘+’ button to submit it.

Notes:

• The input display can only have a maximum of 4 digits.
• The first number in the cycle is gray colored.
• Striking on the module resets it.