import sys
'''
	入出力ライブラリ
'''
_allinput = []
for inp in sys.stdin:
	_allinput += inp.strip().split(" ")
def _input():
	for put in _allinput:
		yield put
_obj = _input();
def __input():
	return _obj.__next__()
def nextInt():
	return int(__input())




n = nextInt()
lst = [nextInt() for i in range(0,n)]
K = nextInt()

l,r = 0, 1000000000
for _ in range(60):
	m = (l+r)/2
	if sum([int(i/m) for i in lst]) < K:
		r = m
	else:
		l = m
print(l)