n, m, t = map(int, input().split())
a = [0] * n
for v in list(map(int, input().split())):
    a[v - 1] += 1
ng, ok = 0, 10**18
while ok - ng != 1:
    vs = (ok + ng) >> 1
    cnt = 0
    for c in a:
        if c <= vs:
            yo = vs - c
            cnt += yo // t
        else:
            cnt -= c - vs
    if cnt >= 0:
        ok = vs
    else:
        ng = vs
print(ok)