#include <iostream>
#include <fstream>

#define ULL unsigned long long

using namespace std;

int k,n;
ULL s;
int v[100002];

inline bool chk(ULL x)
{
    ULL t=0;
    for(int i=1;i<=n;i++)
    {
        if(v[i]>x)
            t+=x;
        else
            t+=v[i];
    }
    if(x*k<=t)
        return 1;
    return 0;
}

int main()
{
    ifstream f("grupuri.in");
    ofstream g("grupuri.out");
    f>>k>>n;
    for(int i=1;i<=n;i++)
    {
        f>>v[i];
        s+=v[i];
    }
    ULL st=1, dr=s/k, ans;
    while(st<=dr)
    {
        ULL m=(st+dr)/2;
        if(chk(m))
        {
            ans=m;
            st=m+1;
        }
        else
            dr=m-1;
    }
    g<<ans<<'\n';
    f.close();
    g.close();
    return 0;
}