#include <fstream>
using namespace std;
ifstream fin ("grupuri.in");
ofstream fout ("grupuri.out");
long long k,n,i,s,nr,v[100001];
int main()
{
    fin>>k>>n;
    for (i=1; i<=n; i++)
    {
        fin>>v[i];
        s=s+v[i];
    }
    nr=s/k;
    fout<<nr;
    return 0;
}