Let $f : \mathbb{Q} \to \mathbb{Q}$ be a function such that $f(1) = 2$ and
\[f(xy) = f(x) f(y) - f(x + y) + 1\]for all $x,$ $y \in \mathbb{Q}.$

Let $n$ be the number of possible values of $f \left( \frac{1}{2} \right),$ and let $s$ be the sum of all possible values of $f \left( \frac{1}{2} \right).$  Find $n \times s.$The answer is in the form rac{m}{n}, where gcd(m, n) = 1. Please provide the value of m + n.

Let's think step by step and output the final answer within \boxed{}.
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