/*╔═══╗──╔╗╔╗───────────────────╔╗────────╔═══╦═══╗
  ║║─║╠╗╠╗╔╣╚═╦══╦═╗╔╦╗╔═╗╔══╦══╣╚═╦╦══╦══╣║─║║║─╚╝
  ║╔═╗║╚╝║╚╣║║║╚╝║║─╔╦╗║║║║╚╝║╚╝║╚╝║║║═╬══║╔═╗║╚╩═║
  ╚╝─╚╩══╩═╩╝╚╩══╩╝─╚╩╝╚╝╚╩══╩══╩══╩╩══╩══╩╝─╚╩═══╝*/

#include<bits/stdc++.h>
using namespace std;

#define f(i,k,n) for(i=k;i<n;i++)
#define fd(i,k,n) for(i=k;i>n;i--)
#define pb push_back
#define mp make_pair
#define ll long long
#define ull unsigned long long
#define vi vector<int>
#define vll vector<ll>
#define vvi vector<vi>
#define vvll vector<vll>
#define pii pair<int,int>
#define pll pair<ll,ll>
#define mii map<int,int>
#define mll map<ll,ll>
#define all(c) c.begin(),c.end()
#define sz(c) (int)c.size()
#define lb lower_bound
#define ub upper_bound
#define gi greater<int>
#define rev reverse
#define ff first
#define ss second
#define yes cout << "YES" << endl
#define no cout << "NO" << endl
#define imp cout << "IMPOSSIBLE" << endl;
#define nl cout << endl
#define hello cout << "hello" << endl;
#define sp(x) fixed << setprecision(x)
#define re return

void dbg_out(){cerr << endl;}
template<typename Head, typename... Tail> void dbg_out(Head H, Tail... T) { cerr << ' ' << H; dbg_out(T...); }
#define dbg(...) cerr << "(" << #__VA_ARGS__ << "):", dbg_out(__VA_ARGS__)

const double pi = 3.14159265359;
const ll mod = 1000000007;
const ll modc = 998244353;

ll inline power(ll a, ll b, ll p){
    a %= p;
    ll ans = 1;
    while(b>0){
        if(b & 1)
            ans = (ans*a)%p;
        a = (a*a)%p;
        b >>= 1;
    }
    return ans;
}

ll mod_inv(ll n, ll p){
    return power(n,p-2, p);
}

bool inline isPrime(ll n) {
    if (n <= 1)  return false;
    if (n <= 3)  return true;
    if (n%2 == 0 || n%3 == 0) return false;
    for (ll i=5; i*i<=n; i=i+6)
        if (n%i == 0 || n%(i+2) == 0)
           return false;
    return true;
}
template<typename... T>
void W(T&&... args)
{
	((cout << sp(9) <<  args << " "), ...);
	nl;
}
template<typename... T>
void R(T&&... args)
{
	((cin >> args), ...);
}
ll ston(string s) 
{
	ll a = 0;
	reverse(s.begin(),s.end());
	ll pow = 1;
	for(int i=0;i<s.size();i++)
	{
		a += pow*(s[i]-'0');
		pow*=10;
	}
	return a;
}
template <class T>
string to_binary(T n) 
{
	string binaryNum;
	int i = 0;
	while (n > 0) {
		binaryNum.pb((n % 2)+'0');
		n = n / 2;
		i++;
	}
	reverse(binaryNum.begin(),binaryNum.end());
	return binaryNum;
}
template<class T>
bool perfectSq(T n)
{
	if(sqrt(n) == floor(sqrt(n)))
		return true;
	else
		false;
}
template<class T>
void wv(T &v)
{
	for(auto x : v)
		cout << x << " " ;
	nl;
}
template<class T>
void rv(T &v)
{
	for(int i=0;i<sz(v);i++)
		cin >> v[i];
}
void solve()
{
	int i,j;ll sum = 0,prod = 1;ll maxl = LONG_MIN,minl = LONG_MAX;int maxi = INT_MIN,mini = INT_MAX;
	int x,n;
	R(x,n);
	vi p(n);
	rv(p);
	map<int,int>hash;
	for(auto x : p)
		hash[x] = 1;
	int diff = 1000;
	int snum = 1000;
	for(i=-1000;i<=1000;i++)
	{
		if(hash[i] == 0)
		{
			if(abs(x-i) < diff)
			{
				diff = abs(x-i);
				snum = i;
			}
			else if(abs(x-i) <= diff)
			{
				if(i < snum)
					snum = i;
			}
		}
	}
	W(snum);
}
int main()
{
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	cout.tie(NULL);
	int t = 1;
	while(t--)
	{
		solve();
	}
}


Measured memory_bytes: 3712