#include<cstdio>


const int nmax=1e5+5;

int n,i,j,v[nmax],k;
long long sum,mid,st,dr,last;

int main()
{
    freopen("grupuri.in","r",stdin);
    freopen("grupuri.out","w",stdout);
    scanf("%d%d",&k,&n);
    for(i=1;i<=n;i++)
    {
        scanf("%d",&v[i]);
        sum+=v[i];
    }
    dr=sum/k;
    while(st<=dr)
    {
        sum=0;
        mid=(st+dr)/2;
        for(i=1;i<=n;i++)
        {
            if(mid>=v[i])
                sum+=v[i];
            else
                sum+=mid;
        }
        if(sum/k>=mid)
        {
            last=sum/k;
            st=mid+1;
        }
        else
            dr=mid-1;
    }
    printf("%lld",last);
}