import sequtils,strutils,math
var
    N = stdin.readline.parseInt
    L = stdin.readline.split.map(parseInt)
    K = stdin.readline.parseInt
    M,m,n : float64

proc `=~`(x,y : float64):bool =
    if abs(x - y) < abs(x) / 10_000_000_000.0:
        return true
    else:
        return false
M = 10e9
m = 0

while (M =~ m) == false:
    n = (M + m) / 2
    var cnt : int
    for l in L:
        cnt += floor(l.float64 / n + 0.0000000001).int
    if cnt < K:
        M = n
    else:
        m = n

echo n