#include<bits/stdc++.h>
using namespace std;
ifstream fin("grupuri.in");
ofstream fout("grupuri.out");
int v[100001];
int main()
{
    int n,k,i;
    long long s=0;
    fin>>k>>n;
    for(i=1;i<=n;i++)
    {
        fin>>v[i];
        s+=v[i];
    }
    while(s/k<v[n])
    {
        s-=v[n];
        n--;
        k--;
    }
    fout<<s/k;
}