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Let $p = 2017$ be a prime number. Let $E$ be the expected value of the expression \[3 \;\square\; 3 \;\square\; 3 \;\square\; \cdots \;\square\; 3 \;\square\; 3\]where there are $p+3$ threes and $p+2$ boxes, and one of the four arithmetic operations $\{+, -, \times, \div\}$ is uniformly chosen at random to replace each of the boxes. If $E = \tfrac{m}{n}$ , where $m$ and $n$ are relatively prime positive integers, find the remainder when $m+n$ is divided by $p$.


Probability  


Combinatorics  


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