#include <fstream>
#include <iostream>

using namespace std;

int main()
{
    ifstream fin("grupuri.in");
    ofstream fout("grupuri.out");
    long long int k,n,i,a,s;
    fin>>k>>n;
    for(i=0;i<n;i++)
    {
        fin>>a;
        s+=a;
    }
    fout<<s/k;
    return 0;
}