#include<cstdio>
using namespace std;
int v[100001];
int main()
{
    freopen("grupuri.in","r",stdin);
    freopen("grupuri.out","w",stdout);
    int n,i,k,mid,ma=0;
    long long dr=0,st=0,c;
    scanf("%d%d",&k,&n);
    for(i=1;i<=n;i++)
    {
        scanf("%d",&v[i]);
        dr+=v[i];
    }
    dr=dr/k;
    while(st<=dr)
    {
        mid=(st+dr)/2;
        c=0;
        for(i=1;i<=n;i++)
        {
            if(v[i]>=mid)
            {
                c+=mid;
            }
            else
            {
                c+=v[i];
            }
        }
        if(c/k>=mid)
        {
            st=mid+1;
            if(ma<mid)
            {
                ma=mid;
            }
        }
        else
        {
            dr=mid-1;
        }
    }
    printf("%d",ma);
    return 0;
}