#include <fstream>
using namespace std;
ifstream cin("grupuri.in");
ofstream cout("grupuri.out");
long long n,k,v[100005],s,st=1,dr,mid,ans;
int main()
{
    cin>>k>>n;
    for(int i=1;i<=n;i++){
        cin>>v[i];
        s+=v[i];
    }
    dr=s;
    while(st<=dr){
        mid=(st+dr)/2;
        s=0;
        for(int i=1;i<=n;i++)
            s+=min(v[i],mid);
        if(mid*k<=s){
            ans=mid;
            st=mid+1;
        }
        else
            dr=mid-1;
    }
    cout<<ans;
    return 0;
}