While camping, Greg experienced a total of 3 + 6 + 5 = 14 mm of rain.
At his house, it rained 26 mm.
Therefore, Greg experienced 26 - 14 = 12 mm less rain while camping.
#### 12
The answer is: 12
Below is a math problem. Provide a detailed, step-by-step solution.

### Problem:
While Greg was camping with his family for a week, it rained for 3 days. When he looked at the weather records, he saw that the amount of rain was 3 mm, 6 mm, and 5 mm on the three days. During the same week, it rained 26 mm at his house. How much less rain did Greg experience while camping?

### Answer:
