from collections import defaultdict

MOD = 998244353
N, M, K = map(int, input().split())
A = list(map(int, input().split()))
X = [0] * (N + 1)
for a in A:
    for i in range(1, N // a + 1):
        X[i * a] += 1

all = pow(M, K, MOD)

dic = defaultdict(int)
for x in X:
    dic[x] += 1

ans = all * (N + 1)
ans %= MOD
for k, v in dic.items():
    ans -= v * pow(M - k, K, MOD)
    ans %= MOD
ans *= pow(all, -1, MOD)
ans %= MOD
print(ans)