N,M,T = map(int,input().split())
A = list(map(lambda x:int(x)-1,input().split()))

ng = 0
ok = M

while ok - ng > 1:
  mid = (ng + ok + 1)//2
  array = [mid]*M
  res = 0
  for a in A:
    if array[a] > 0:
      array[a] = -1
    else:
      res += 1
  cap = 0
  for i in range(M):
    cap += array[i]//T
  if cap >= res:
    ok = mid
    #print(ng,mid,ok,True)
  else:
    ng = mid
    #print(ng,mid,ok,False)
    
print(ok)