n, m, t = map(int, input().split())
a = list(map(int, input().split()))
x = [0] * n
for i in range(m):
    x[a[i] - 1] += 1
l, r = 0, m + 1
while r - l > 1:
    md = (l + r) // 2
    c = 0
    for i in range(n):
        if md < x[i]:
            c += x[i] - md
        else:
            c -= (md - x[i]) // t
    if c > 0:
        l = md
    else:
        r = md
print(r)