N,M,T=map(int, input().split())
A=list(map(int, input().split()))
C=[0]*N
for a in A:
  C[a-1]+=1
  
l,r=0,10**15
while r-l>1:
  mid=(l+r)//2 
  p=0;t=0
  for c in C:
    if c>mid:
      p+=c-mid 
    else:
      t+=(mid-c)//T 
  if p>t:
    l=mid 
  else:
    r=mid 
print(r)