n, m, t = map(int, input().split())
A = list(map(int, input().split()))
T = [0] * n
for a in A:
    T[a-1] += 1

l = 0
r = 10 ** 16
while r - l > 1:
    mid = (l + r) >> 1
    el = 0
    ell = 0
    for i in range(n):
        k = T[i]
        if k > mid:
            el += k - mid
        else:
            ell += (mid - k) // t
    if ell >= el:
        r = mid
    else:
        l = mid
print(r)