#include <bits/stdc++.h>

using namespace std;
using ll = long long;

int main()
{
    ll t1, t2, ts, a;
    vector<long long> z1;
    cin >> t1 >> t2;
    ts = t2;

    while (t2-- > 0)
    {
        cin >> a;
        z1.push_back(a);
    }
    ll n = 1, x, z = 0;
    while (n <= t1)
    {
        for (int i = 0; i < ts; i++)
        {
            if (n != z1.at(i))
            {
                z += 1;
            }

            if (z == ts)
            {
                cout << n << '\n';
                return 0;
            }
        }
        z = 0;
        n += 1;
    }
    cout << "too late" << '\n';

    return 0;
}