import sys sys.setrecursionlimit(10**7) def I(): return int(sys.stdin.readline().rstrip()) def MI(): return map(int,sys.stdin.readline().rstrip().split()) def LI(): return list(map(int,sys.stdin.readline().rstrip().split())) def LI2(): return list(map(int,sys.stdin.readline().rstrip())) def S(): return sys.stdin.readline().rstrip() def LS(): return list(sys.stdin.readline().rstrip().split()) def LS2(): return list(sys.stdin.readline().rstrip()) N = I() L = LI() K = I() ok = 0 ng = max(L)+1 for _ in range(70): mid = (ok+ng)/2 if sum(int(l/mid) for l in L) >= K: ok = mid else: ng = mid print(ok)