#include <iostream>
#include <fstream>
using namespace std;

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

long n, k;
int main()
{
    long s = 0, x;

    in >> k >> n;
    for ( long i=1; i<=n; ++i )
        {
            in >> x;
            s += x;
        }

    out << s/k;
}