#include <cstdio>

using namespace std;

const int NMAX = 100000;

int v[NMAX];

int main()
{
    freopen("grupuri.in","r",stdin);
    freopen("grupuri.out","w",stdout);
    int k,N,i,copie = 0,S;

    scanf("%d%d",&k,&N);
    for (i = 1;i <= N;i++)
    {
    scanf("%d",&v[i]);
    copie = copie + v[i];
    }
    S = copie - copie % k;
    S = S / k;
    printf("%d",S);

    return 0;
}