#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("grupuri.in");
ofstream fout("grupuri.out");
int main()
{
    int n,k,i;
    long long int s=0;
    fin>>k>>n;
    i=1;
    int x;
    for(int j=1;j<=n;j++)
    {
        fin>>x;
        s+=x;
    }
    while(i*k<=s)
    {
        i++;
    }
    fout<<i-1;
    return 0;
}