#include <fstream>

using namespace std;
long long k,n,v[100001],i,j,l1,l2,mid,s,o;
int main()
{
    ifstream f("grupuri.in");
    ofstream g("grupuri.out");
    f>>k>>n;
    for(i=1; i<=n;i ++)
    {
        f>>v[i];
        s+=v[i];
    }
    l2=s/k;
    while(l1<=l2)
    {
        long long s1=0;
        mid=(l1+l2)/2;
        for(i=1; i<=n; i++)
        {
            if(mid>=v[i])
                s1+=v[i];
            else
                s1+=mid;
        }
        if(s1/k>=mid)
        {
            o=mid;
            l1=mid+1;
        }
        else
            l2=mid-1;
    }
    g<<o<<'\n';
    f.close(); g.close();
    return 0;
}