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#include <bits/stdc++.h>
#define cin fin
#define cout fout
using namespace std;
ifstream fin ("grupuri.in");
ofstream fout ("grupuri.out");
int n,k,v[100006];
bool ver (long long int x)
{
long long int s=k*x;
for(int i=1;i<=n;i++)
{
if(v[i]>=x)
{
s-=x;
}
else
{
s-=v[i];
}
}
if(s<=0)
{
return 1;
}
else
return 0;
}
int main()
{
cin>>k>>n;
for(int i=1;i<=n;i++)
{
cin>>v[i];
}
long long int st=1,dr=1e11;
long long int rasp=0, mij;
while(st<=dr)
{
mij=(st+dr)/2;
if(ver(mij))
{
st=mij+1;
rasp=mij;
}
else
{
dr=mij-1;
}
}
cout<<rasp;
return 0;
}