#include <fstream>

using namespace std;
ifstream f("grupuri.in");
ofstream g("grupuri.out");
long long S,st,dr,mid,sol;
int i,n,v[100001],k;
int valid(long long x){
    S=0;
    for(i=1;i<=n;i++){
        if(v[i]<mid)
            S+=v[i];
        else
            S+=mid;
    }
    if(S>=k*mid)
        return 1;
    return 0;
}
int main()
{   f>>k>>n;
    for(i=1;i<=n;i++){
        f>>v[i];
        S+=v[i];
    }
    st=0;dr=S/k;
    while(st<=dr){
        mid=(st+dr)/2;
        if(valid(mid)==1){
            sol=mid;
            st=mid+1;
        }
        else
            dr=mid-1;
    }
    g<<sol;
    return 0;
}