n, m, t = map(int, input().split())
a = list(map(lambda x: int(x)-1, input().split()))
l, r = 0, 1 << 60
while r - l > 1:
  piv = (l + r) // 2
  oven = [0] * n
  cnt = 0
  for v in a:
    if oven[v] < piv:
      oven[v] += 1
    else:
      cnt += 1
  for v in oven:
    cnt -= (piv - v) // t
  if cnt > 0:
    l = piv
  else:
    r = piv
print(r)