def check(x):
    nokori = 0
    O = []
    for i in range(N):
        if x-D[i]>=0:
            O.append(x-D[i])
        else:
            nokori += D[i]-x
    while nokori>0:
        while O and O[-1]<T:
            O.pop()
        if O and O[-1]>=T:
            O[-1]-=T
            nokori -= 1
        else:
            break
    return nokori==0

import sys
input = sys.stdin.readline
N, M, T = map(int, input().split())
A = list(map(int, input().split()))
D = [0 for _ in range(N)]
for a in A:
    a-=1
    D[a] += 1
l = 0
r = 10**18
while r-l>1:
    mid = (l+r)//2
    if check(mid):
        r = mid
    else:
        l = mid
print(r)