//Lasha Bukhnikashvili
#include<iostream>
#include<stdio.h>
#include<cstdlib>
#include<math.h>
#include<algorithm>
#include<vector>
#include<fstream>
#include<string>
#include<stack>
#include <iomanip>
#define pi 3.1415926535
#define mod9 1000000009
#define mod7 1000000007
#define INF 1000000000
#define starttime clock_t startTime = clock();
#define endtime cout<< double(clock()-startTime)/(double)CLOCKS_PER_SEC<<"seconds."<<endl;
using namespace std;
 long long ans,i,mid,l,r,n,m,t[100001];
int main(){
 //freopen("input.txt","r",stdin);
 //freopen("output.txt","w",stdout);
   cin>>n>>m;
   for (i=1;i<=n;i++)
       cin>>t[i];
   l=1; r=1000000000; r=r*r;
   while (l<r){
         ans=0;
         mid=(l+r)/2;
         for (i=1;i<=n;i++)
             ans=ans+mid/t[i];
         if (ans<m) l=mid+1; else r=mid;
   };
   cout<<l;
 return 0;
}