#include <cstdio>
#include <cmath>

using namespace std;

const int N = 100010; 

int n, m;
int a[N];

bool check(double x) {
    int res = 0;
    for (int i = 0; i < n; ++i) {
        res += floor(a[i] / x);
        if (res >= m) {
            return true;
        }
    }
    return false;
}

int main() {
    scanf("%d%d",&n, &m);
    for (int i = 0; i < n; ++i) {
        scanf("%d", &a[i]);
    }

    double l = 0;
    double r = 1e9;

    while (l + 1e-4 < r) {
        const double mid = (l + r)/2.0;
        if (check(mid)) {
            l = mid;
        } else {
            r = mid;
        }
    }

    printf("%.2f", r);

    return 0;
}