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