#include<fstream>
#include<algorithm>
#define ll long long
#define max(a,b) (a>b) ? a : b
using namespace std;

ifstream cin("grupuri.in");
ofstream cout("grupuri.out");

const int N=100010;
long long n,i,k,a[N];
long long sum,l,r,mij,sol;;

int f(ll x)
{
    long long s=0;
    for (int i=1;i<=n;i++)s+=min(a[i],x);
    if (x*k>s) return 0;
    return 1;
}

int main()
{
    cin>>k>>n;
    for (i=1;i<=n;i++)cin>>a[i],sum+=a[i];
    l=0;r=sum/k;

    while (l<=r)
    {
        mij=(l+r)/2;
        if (f(mij)) l=mij+1;
        else r=mij-1;
    }
    cout<<r;
    return 0;
}