#include<stdio.h>
int v[100000];
int main()
{
    FILE *fin,*fout;
    fin=fopen("grupuri.in","r");
    fout=fopen("grupuri.out","w");
    int k,n;
    fscanf(fin,"%d%d",&k,&n);
    int i;
    long long s=0;
    for(i=0; i<n; i++)
    {
        fscanf(fin,"%d",&v[i]);
        s+=v[i];
    }
    i=n-1;
    while(s/k<v[i])
    {
        s=s-v[i];
        k--;
        i--;
    }
    fprintf(fout,"%lld",s/k);
    return 0;
}