#include<fstream>
using namespace std;
ifstream f("grupuri.in");
ofstream g("grupuri.out");
int n,k,i,a[100001];
long long s;
int main()
{f>>k>>n;
for(i=1;i<=n;++i)
{f>>a[i];
s+=a[i];
}
i=n;
while(s/k<a[i])
{s-=a[i];
--k;
--i;
}
g<<s/k<<'\n';
return 0;
}