#include <fstream>

using namespace std;

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

long long k,n,a[100010],s;

int main()
{
    fin>>k>>n;
    for(int i=1;i<=n;i++){
        fin>>a[i];
        s+=a[i];
    }
    fin.close();

    while(s/k<=a[n])
    {
        s-=a[n];
        n--;
        k--;
    }

    fout<<s/k<<'\n';
    fout.close();
    return 0;
}