#include <bits/stdc++.h>
#define fr first
#define sc second
#define rep(i, n) for(int i = 0; i < (n); ++i)
#define rrep(i, n) for(int i = 1; i <= (n); ++i)
#define drep(i, n) for(int i = (n)-1; i >= 0; --i)
#define srep(i, s, t) for(int i = s; i < t; ++i)
#define rng(a) a.begin(), a.end()
#define rrng(a) a.rbegin(), a.rend()
#define isin(x, l, r) ((l) <= (x) && (x) < (r))
#define pb push_back
#define eb emplace_back
#define sz(x) (int)(x).size()
#define pcnt __builtin_popcountll
#define uni(x) x.erase(unique(rng(x)), x.end())
#define snuke srand((unsigned)clock() + (unsigned)time(NULL));
#define show(x) cout << #x << " = " << x << endl;
#define PQ(T) priority_queue<T, v(T), greater<T>>
#define bn(x) ((1 << x) - 1)
#define dup(x, y) (((x) + (y)-1) / (y))
#define newline puts("")
#define v(T) vector<T>
#define vv(T) v(v(T))
using namespace std;
typedef long long int ll;
typedef unsigned uint;
typedef unsigned long long ull;
typedef pair<int, int> P;
// typedef tuple<int, int, int> T;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef vector<ll> vl;
typedef vector<P> vp;
// typedef vector<T> vt;
inline int getInt() {
    int x;
    scanf("%d", &x);
    return x;
}
template <typename T> inline istream &operator>>(istream &i, v(T) & v) {
    rep(j, sz(v)) i >> v[j];
    return i;
}
template <typename T> string join(const v(T) & v) {
    stringstream s;
    rep(i, sz(v)) s << ' ' << v[i];
    return s.str().substr(1);
}
template <typename T> inline ostream &operator<<(ostream &o, const v(T) & v) {
    if(sz(v))
        o << join(v);
    return o;
}
template <typename T1, typename T2>
inline istream &operator>>(istream &i, pair<T1, T2> &v) {
    return i >> v.fi >> v.se;
}
template <typename T1, typename T2>
inline ostream &operator<<(ostream &o, const pair<T1, T2> &v) {
    return o << v.fi << "," << v.se;
}
template <typename T> inline ll suma(const v(T) & a) {
    ll res(0);
    for(auto &&x : a)
        res += x;
    return res;
}
template <class T> bool chmax(T &a, const T &b) {
    if(a < b) {
        a = b;
        return 1;
    }
    return 0;
}
template <class T> bool chmin(T &a, const T &b) {
    if(b < a) {
        a = b;
        return 1;
    }
    return 0;
}
const double eps = 1e-10;
const ll LINF = 1001002003004005006ll;
const int INF = 1001001001;
#define dame                                                                   \
    {                                                                          \
        puts("-1");                                                            \
        return 0;                                                              \
    }
#define yn                                                                     \
    { puts("Yes"); }                                                           \
    else {                                                                     \
        puts("No");                                                            \
    }

int main() {
    int X, N;
    set<int> s;
    cin >> X >> N;
    rep(i, N) {
        int tmp;
        cin >> tmp;
        s.insert(tmp);
    }
    int ans = 0;
    int val = X;

    rep(i, 201) {
        if(s.find(i) == s.end() && chmin(val, abs(X - i)))
            ans = i;
    }

    cout << ans << endl;
}

Measured memory_bytes: 3624