#include <fstream>

using namespace std;

ifstream in("grupuri.in");
ofstream out ("grupuri.out");
int n,k,nr, s;
int main()
{
    in>>k>>n;
    for (register int i=1; i<=n; ++i)
    {
        in>>nr;
        s+=nr;
    }
    out<<s/k;
    return 0;
}