N,M,T=map(int,input().split())
ok=10**18
ng=0
A=list(map(int,input().split()))
cnt=[0]*N
for i in range(M):
    A[i]-=1
    cnt[A[i]]+=1
while ok-ng>1:
    mid=(ok+ng)//2
    rest=0
    can=0
    for i in range(N):
        rest+=max(0,cnt[i]-mid)
        can+=max(0,mid-cnt[i])//T
    if can>=rest:
        ok=mid
    else:
        ng=mid
print(ok)