#include <fstream>

using namespace std;

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

int n, k;
int v[100000];
long long sum;

int main()
{
    in >> k >> n;
    for(int i = 0; i < n; i ++){
        in >> v[i];
        sum += v[i];
    }
    out << sum / k;
    return 0;
}