#include <fstream>
using namespace std;
ifstream fin("grupuri.in");
ofstream fout("grupuri.out");
int v[100001];
int main()
{
    long long n, k, st, dr, mij, i, s=0, rez;
    fin>>k>>n;
    for(i=1;i<=n;i++)
    {
        fin>>v[i];
        s+=v[i];
    }
    st=1;
    dr=s/k;
    while(st<=dr)
    {
        mij=(st+dr)/2;
        s=0;
        i=1;
        while(s<mij*k && i<=n)
        {
            if(v[i]<mij)
                s+=v[i];
            else
                s+=mij;
            i++;
        }
        if(s>=mij*k)
        {
            rez=mij;
            st=mij+1;
        }
        else
            dr=mij-1;
    }
    fout<<rez;
    return 0;
}