#include<fstream>
#include<algorithm>
using namespace std;

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

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

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

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)) sol=mij,l=mij+1;
        else r=mij-1;
    }
    cout<<sol;
    return 0;
}