#include<cstdio>
long long k,n,v[100001],i,j,l1,l2,mid,s,o;
int main ()
{
freopen("grupuri.in","r",stdin);
freopen("grupuri.out","w",stdout);
scanf("%lld%lld",&k,&n);
for(i=1;i<=n;i++)
    {
    scanf("%lld",&v[i]);
    s+=v[i];
    }
l2=s/k;
while(l1<=l2)
    {
    long long s1=0;
    mid=(l1+l2)/2;
    for(i=1;i<=n;i++)
        {
        if(mid>=v[i])
            s1+=v[i];
        else
            s1+=mid;
        }
    if(s1/k>=mid)
        {
        o=mid;
        l1=mid+1;
        }
    else
        l2=mid-1;
    }
printf("%lld",o);
return 0;
}