n, m, t = map(lambda s_: int(s_), input().split())
a = tuple(map(lambda s_: int(s_) - 1, input().split()))
fav = [0] * n
for ai in a:
    fav[ai] += 1

def pred(x):
    over = 0
    slow = 0
    for ai in fav:
        if ai <= x:
            slow += (x - ai) // t
        else:
            over += ai - x
    return over <= slow

ng = 0
ok = 1
while not pred(ok):
    ok *= 2
while abs(ok - ng) > 1:
    mi = (ok + ng) // 2
    if pred(mi):
        ok = mi
    else:
        ng = mi
print(ok)