import sys
input = sys.stdin.readline

from collections import Counter

N,M,T=map(int,input().split())
A=list(map(int,input().split()))

C=Counter(A)

OK=10**9
NG=0

while OK>NG+1:
    mid=(OK+NG)//2

    rest=0
    ko=0

    for i in range(1,N+1):
        x=C[i]

        if x==mid:
            pass
        elif x>mid:
            rest+=x-mid
        else:
            ko+=(mid-x)//T

    if rest<=ko:
        OK=mid
    else:
        NG=mid

print(OK)