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#include <fstream>
using namespace std;
ifstream fin("grupuri.in");
ofstream fout("grupuri.out");
int k,n,v[100005],i,st,dr,mij,sol;
long long s;
bool dinamica(){
int s=0;
for(int i=1;i<=n;i++)
if(v[i]>=mij)
s+=mij;
else
s+=v[i];
if(s>=k*mij)
return 1;
return 0;
}
int main(){
fin>>k>>n;
for(i=1;i<=n;i++){
fin>>v[i];
s+=v[i];
}
st=0; dr=s/k;
while(st<=dr){
mij=(st+dr)/2;
if(dinamica()){
sol=mij;
st=mij+1;
}
else dr=mij-1;
}
fout<<sol;
return 0;
}