#include <iostream>
#include <cstdio>
using namespace std;
const int N = 1E5 + 10;
typedef long long ll;
double a[N];
int n, m;   
bool check(double x){
    int k = 0;
    for(int i = 0; i < n; i ++ )    k += int(a[i] / x);
    return k >= m;
}
int main(){
    cin >> n >> m;
    for(int i = 0; i < n; i ++ ){
        cin >> a[i];
    }    
    double l = 0, r = 1e9;
    while(r - l > 1e-4){
        double mid = (l + r) / 2;
        if(check(mid))  l = mid;
        else    r = mid;
    }
    printf("%.2lf", r);
    return 0;
}