import sys
input = sys.stdin.readline
MOD = 998244353
N, M, K = map(int, input().split())
A = list(map(int, input().split()))
cnt = [0 for _ in range(N)]
for a in A:
    for j in range(a, N+1, a):
        cnt[j-1] += 1
power = []
base = pow(M, K, MOD)
for i in range(M+1):
    power.append((base-pow(i, K, MOD))%MOD)
ans = 0
for c in cnt:
    ans += power[M-c]
    ans %= MOD

ans *= pow(pow(M, MOD-2, MOD), K, MOD)
ans %= MOD
print(ans)