#include <fstream>
using namespace std;
ifstream fin("grupuri.in");
ofstream fout("grupuri.out");
long long n,k,v[1000001],s;
int main()
{
    fin>>k>>n;
    for(int i=1;i<=n;i++){
        fin>>v[i];
        s=s+v[i];
    }
    while(s/k<v[n]){
        n=n-1;
        k=k-1;
        s-=v[n];
    }
    fout<<s/k;

    return 0;
}