#include<bits/stdc++.h>
#define ll          long long
#define epsilon 0.000000001
using namespace std;
ll n , k ;
vector<ll>arr;

bool check(long double mid){

    ll cnt = 0 ;
    for(ll i = 1 ; i <= n ; i++){
        cnt+=arr[i]/mid;
    }
    return cnt>=k ;

}


int main()
{
cin>> n >> k ;
arr.assign(n+1,0);
for(int i =  1 ; i <= n ; i++){
    cin >> arr[i];
}
double lo = 0 , hi = 1e15;
long double mid ;
while(hi-lo>=epsilon){
     mid = (lo+hi)/2;
     if(check(mid)){
        lo = mid ;
     }else{
        hi = mid ;
     }

}
cout << lo ;
}