#include <fstream>
using namespace std;
ifstream f("grupuri.in");
ofstream g("grupuri.out");
int s,k,n,i,x;
int main()
{
    f >> k >> n;
    for(i = 1; i <= n; ++i)
    {
        f >> x;
        s += x;
    }
    g << s / k << '\n';
    return 0;
}