#include <bits/stdc++.h>
#define For(i,a,b) for(int i=a;i<=b;i++)
#define Forr(i,a,b) for(int i=a;i>=b;i--)
#define F first
#define S second
#define sz(x) ((int)x.size())
#define all(x) x.begin(),x.end()
#define eb emplace_back
#define INF (LL)(9e18)
#define int __int128_t
using namespace std;
using LL=long long;
using pii=pair<int,int>;
const int MAXN=300030;
int a[MAXN];
int b[MAXN];
bool check(int n,int m,int tar){
int s=0;
For(i,1,n){
s+=(tar+a[i]-1)/a[i];
}
return s<=n*m;
}
int32_t main(){
ios::sync_with_stdio(false);
cin.tie(0);
// OAO
LL n,m; cin>>n>>m;
For(i,1,n){
LL t; cin>>t;
a[i]=t;
}
int hi=1000000000000000010;
int lo=0;
while(hi-lo>1){
int mi=lo+(hi-lo)/2;
if(check(n,m,mi)) lo=mi;
else hi=mi;
}
cout<<(LL)lo<<"\n";
return 0;
}
