#include <fstream>
using namespace std;
ifstream fin("grupuri.in");
ofstream fout("grupuri.out");
long long n,k,i,s,st,dr,mid,v[100001];
int main() {
    fin>>k>>n;
    for (i=1;i<=n;i++) {
        fin>>v[i];
        s+=v[i];
    }
    st=1;
    dr=s/k;
    while (st<=dr) {
        mid=(st+dr)/2;
        s=0;
        for (i=1;i<=n;i++)
            s+=min(mid,v[i]);
        if (mid<=s/k)
            st=mid+1;
        else
            dr=mid-1;
    }
    fout<<dr;
    return 0;
}