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#include <fstream>
using namespace std;
ifstream fin("grupuri.in");
ofstream fout("grupuri.out");
long long n,k,i,a[100001];
int ok(long long mid)
{
long long s=0;
for(int i=1; i<=n; i++)
s+=min(a[i],mid);
if(s>=mid*k) return true;
return false;
}
int cauta()
{
int l=0;
int r=n;
long long mid;
while(r-l>1)
{
mid=(l+r)/2;
if(ok(mid)) l=mid;
else r=mid;
}
return l;
}
int main()
{
fin>>k>>n;
for(i=1; i<=n; i++) fin>>a[i];
int nr=cauta();
fout<<nr;
return 0;
}