Element closest to R

You are given an array of $n$ numbers and a number $R$. Find the element closest to $R$, i.e. with the smallest $|a_i - R|$. If there are several, print the first of them.

The first line contains $n$ and $R$ ($1 \le n \le 10^5$, $|R| \le 10^9$). The second line contains integers ().

A single number — the element found.

Compute the distance with an absolute value: abs(a[i] - R). To keep the first one on ties, update only on a strictly smaller distance (<, not <=). In the second example $4$ and $16$ are both at distance $6$, but $12$ is at distance $2$: the answer is $$.