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#include <fstream>
using namespace std;
ifstream fin("grupuri.in");
ofstream fout("grupuri.out");
long long n,k,x,v[100001], grupuri,st,dr,sol;
int main()
{
fin>>k>>n;
for(int i=1; i<=n; i++)
{
fin>>v[i];
}
st=0,dr=2e12;
while(st<=dr)
{
long long m=(st+dr)/2,sum=0;
for(int i=1; i<=n; i++)
{
sum+=min(v[i],m);
}
if(sum<m*k)
{
dr=m-1;
}
else st=m+1,sol=m;
}
fout<<sol;
return 0;
}