Andover has a special weather forecast this week. On Monday, there is a $\frac{1}{2}$ chance of rain. On Tuesday, there is a $\frac{1}{3}$ chance of rain. This pattern continues all the way to Sunday, when there is a $\frac{1}{8}$ chance of rain. The probability that it doesn't rain in Andover all week can be expressed as $\frac{m}{n}$ for relatively prime positive integers $m$ and $n$. Compute $m+n$.

[i]Proposed by Nathan Xiong[/i]
1. The probability that it doesn't rain on a given day is the complement of the probability that it rains. For Monday, the probability that it doesn't rain is:
   \[
   1 - \frac{1}{2} = \frac{1}{2}
   \]

2. For Tuesday, the probability that it doesn't rain is:
   \[
   1 - \frac{1}{3} = \frac{2}{3}
   \]

3. This pattern continues for each day of the week. Therefore, the probabilities for each day are:
   \[
   \begin{aligned}
   &\text{Monday: } \frac{1}{2}, \\
   &\text{Tuesday: } \frac{2}{3}, \\
   &\text{Wednesday: } \frac{3}{4}, \\
   &\text{Thursday: } \frac{4}{5}, \\
   &\text{Friday: } \frac{5}{6}, \\
   &\text{Saturday: } \frac{6}{7}, \\
   &\text{Sunday: } \frac{7}{8}.
   \end{aligned}
   \]

4. The probability that it doesn't rain all week is the product of the probabilities that it doesn't rain each day:
   \[
   \left(1 - \frac{1}{2}\right) \cdot \left(1 - \frac{1}{3}\right) \cdot \left(1 - \frac{1}{4}\right) \cdot \left(1 - \frac{1}{5}\right) \cdot \left(1 - \frac{1}{6}\right) \cdot \left(1 - \frac{1}{7}\right) \cdot \left(1 - \frac{1}{8}\right)
   \]

5. Simplifying each term, we get:
   \[
   \frac{1}{2} \cdot \frac{2}{3} \cdot \frac{3}{4} \cdot \frac{4}{5} \cdot \frac{5}{6} \cdot \frac{6}{7} \cdot \frac{7}{8}
   \]

6. Notice that the numerator and denominator have a telescoping pattern:
   \[
   \frac{1 \cdot 2 \cdot 3 \cdot 4 \cdot 5 \cdot 6 \cdot 7}{2 \cdot 3 \cdot 4 \cdot 5 \cdot 6 \cdot 7 \cdot 8}
   \]

7. The terms in the numerator and denominator cancel out, leaving:
   \[
   \frac{1}{8}
   \]

8. The probability that it doesn't rain all week is therefore:
   \[
   \frac{1}{8}
   \]

9. The fraction \(\frac{1}{8}\) is already in simplest form, with \(m = 1\) and \(n = 8\). Therefore, \(m + n = 1 + 8 = 9\).

The final answer is \( \boxed{ 9 } \).