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+# Day 3: Mull It Over
+
+## Problem Description
+
+The North Pole Toboggan Rental Shop's computers are having issues with corrupted
+memory.
+The program is trying to multiply numbers but the instructions are jumbled up.
+
+## Rules
+
+- Valid instructions are in the format `mul(X,Y)` where X and Y are 1-3 digit numbers
+- Example: `mul(44,46)` multiplies 44 by 46 to get 2024
+- Invalid instructions should be ignored, examples:
+  - `mul(4*`
+  - `mul(6,9!`
+  - `?(12,34)`
+  - `mul ( 2 , 4 )`
+
+## Example
+
+Given the corrupted memory:
+
+```txt
+xmul(2,4)%&mul[3,7]!@^do_not_mul(5,5)+mul(32,64]then(mul(11,8)mul(8,5))
+```
+
+Only these instructions are valid:
+
+- mul(2,4)
+- mul(5,5)
+- mul(11,8)
+- mul(8,5)
+
+```sh
+Total = (2*4) + (5*5) + (11*8) + (8*5) = 161
+```
+
+## Task
+
+Scan the corrupted memory for valid mul instructions and sum their results.