n,m,T=map(int,input().split())
a=list(map(int,input().split()))
ok=m
ng=0
while ok-ng>1:
  m=(ok+ng)//2
  c=[0]*(n+1)
  x=0
  for i in a:
    if c[i]<m:
      c[i]+=1
    else:
      x+=1
  if x<=sum((m-c[i])//T for i in range(1,n+1)):
    ok=m
  else:
    ng=m
print(ok)