#include <fstream>
#define NM 100005

using namespace std;

ifstream fin("grupuri.in");
ofstream fout("grupuri.out");

int n, k, i;
int v[NM], s;

int main()
{
    fin >> k >> n;
    for (i=1; i<=n; i++)
    {
        fin >> v[i];
        s+=v[i];
    }
    s/=k;
    fout << s << '\n';
    fin.close();
    fout.close();
    return 0;
}