#include <bits/stdc++.h>
using namespace std;
ifstream f("grupuri.in");
ofstream g("grupuri.out");
int n,k;
unsigned long long suma1;
int main()
{
    f>>k>>n;
    int x;
    for(int i=1;i<=n;i++){
        f>>x;
        suma1+=x;}
        g<<suma1/k;
        return 0;
}