from collections import defaultdict

MOD = 998244353
N, M, K = map(int, input().split())
A = list(map(int, input().split()))
dic0 = defaultdict(int)
for a in A:
    dic0[a] += 1

dic1 = defaultdict(int)
for k, v in dic0.items():
    for i in range(1, N // k + 1):
        dic1[i * k] += v

dic2 = defaultdict(int)
for v in dic1.values():
    dic2[v] += 1
ans = 0
all = pow(M, K, MOD)
for k, v in dic2.items():
    ans += v * (all - pow(M - k, K, MOD))
    ans %= MOD
ans *= pow(all, -1, MOD)
ans %= MOD
print(ans)