#include <fstream>
using namespace std;
int x[100100];
int main()
{
    int i, n, k;
    long long sum = 0;
    ifstream cin("grupuri.in");
    ofstream cout("grupuri.out");
    cin>>k>>n;
    for (i = 1; i <= n; i ++)
    {
        cin>>x[i];
        sum += x[i];
    }

    for (i = n; i >= 1; i --)
    {
        if (x[i] <= sum / k)
        {
            cout<<(sum/k)<<"\n";
            return 0;
        }
        sum = sum - x[i];
        k --;
    }

    return 0;
}