R ga eng yaqin element

$n$ ta sondan iborat massiv va son $R$ berilgan. Massivning $R$ ga eng yaqin elementini, ya'ni $|a_i - R|$ eng kichik bo'lgan elementni toping. Bunday elementlar bir nechta bo'lsa, ulardan birinchisini chiqaring.

Birinchi qatorda $n$ va $R$ ($1 \le n \le 10^5$, $|R| \le 10^9$). Ikkinchi qatorda $n$ ta butun son ($|a_i| \le 10^9$).

Bitta son — topilgan element.

Masofani modul bilan hisoblang: abs(a[i] - R). Teng masofada birinchisi qolishi uchun faqat qat'iy kichik masofada yangilang (<, <= emas). Ikkinchi misolda $4$ va $16$ ikkalasi ham $6$ masofada, lekin $12$ — $2$ masofada: javob $12$.