#include<iostream>
#include<stdio.h>
using namespace std;
int main(){
freopen("grupuri.in","r",stdin);
freopen("grupuri.out","w",stdout);
int n,k,c,s=0,su=0,m,i,v[1000001];
long long dr,st;
cin>>k>>n;
st=1;
for(i=1;i<=n;i++){
   cin>>v[i];
    s=s+v[i];
}
dr=s/k;
    while(st<=dr){
        su=0;
        m=(st+dr)/2;
        for(i=1;i<=n;i++){
            if(v[i]>=m)
                su+=m;
            else
                su+=v[i];
            if(su/k>=m){
                st=m+1;
                c=m;}
            else
                dr=m-1;
    }
}
cout<<c;
return 0;
}