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#include <fstream>
using namespace std;
ifstream f("grupuri.in");
ofstream g("grupuri.out");
int k,n,st,mij,a[10002];
long long dr;
bool verif(int x)
{
long long sum=0;
for(int i=1; i<=n; i++)
{
sum+=min(x,a[i]);
}
return (sum>=1LL*x*k);
}
int main()
{
f>>k>>n;
for(int i=1; i<=n; i++)
{
f>>a[i];
dr+=a[i];
}
dr/=k;
st=1;
while(st<=dr)
{
mij=(st+dr)>>1;
if(verif(mij))st=mij+1;
else dr=mij-1;
}
g<<dr<<'\n';
return 0;
}