"use strict";
var input = require("fs").readFileSync("/dev/stdin", "utf8");
var cin = input.split(/ |\n/),
    cid = 0;

// number一個取得
// eslint-disable-next-line no-unused-vars
const next = () => +cin[cid++];

// 文字列一個取得
// eslint-disable-next-line no-unused-vars
const nextstr = () => cin[cid++];

// BigInteger一個取得
// eslint-disable-next-line no-unused-vars
const nextbig = () => BigInt(cin[cid++]);

// 長さnの配列として取得。aは文字列フラグ
// eslint-disable-next-line no-unused-vars
const nexts = (n, a) =>
    a ? cin.slice(cid, (cid += n)) : cin.slice(cid, (cid += n)).map((a) => +a);

// w個ずつを組にして長さhの配列。aは文字列フラグ。
// eslint-disable-next-line no-unused-vars
const nextm = (h, w, a) => {
    var r = [],
        i = 0;
    if (a) for (; i < h; i++) r.push(cin.slice(cid, (cid += w)));
    else for (; i < h; i++) r.push(cin.slice(cid, (cid += w)).map((a) => +a));
    return r;
};
// 多次元配列。v,a1,a2,a3 なら、3次元。[[値vで長さa3の配列]をa2個並べた配列]をa1個並べた配列。
// eslint-disable-next-line no-unused-vars
const xArray = (...args) => {
    var a = args,
        l = a.length,
        r = "Array(a[" + --l + "]).fill().map(x=>{return " + a[0] + ";})";
    while (--l) r = "Array(a[" + l + "]).fill().map(x=>" + r + ")";
    return eval(r);
};

console.log(main());

function main() {
    let x = next();
    let n = next();
    if (n == 0) return x;
    let p = nexts(n);
    let min = 200;
    let v = 200;
    p = Array.from(new Set(p));
    p = p.sort((a, b) => {
        let j = Math.abs(x - a) - Math.abs(x - b);
        //console.log(a, b, j);
        if (j != 0) return j;
        if (j == 0) return a - b;
    });
    console.log(p);
    if (x != p[0]) return x;
    let j = 1; //pのindex
    for (let i = 1; i < 110; i++) {
        if (x - i != p[j]) return x - i;
        j++;
        if (x + i != p[j]) return x + i;
        j++;
    }
}
