#include <fstream>

using namespace std;

ifstream fin("grupuri.in");
ofstream fout("grupuri.out");

int n, k, v[100005];

int main()
{
    fin >> k >> n;
    for(int i = 1; i <= n; i++)
    {
        fin >> v[i];
        v[i] += v[i - 1];
    }
    while(v[n] - v[n - 1] > v[n] / k)
    {
        n--;
        k--;
    }
    fout << v[n] / k;
    return 0;
}