from collections import defaultdict
MOD=998244353
N,M,K=list(map(int,input().split()))
A=list(map(int,input().split()))
card=[0]*(N+1)
for i in A:
	if i<=N:
	  card[i]+=1
cnt=[0]*(N+1)
for i in range(1,N+1):
	if card[i]==0:
		continue
	for j in range(i,N+1,i):
		cnt[j]+=card[i]
ans=defaultdict(int)
for i in range(1,N+1):
	ans[M-cnt[i]]+=1
ANS=(N*pow(M,K,MOD))%MOD
for i in range(1,M+1):
	ANS=(ANS-ans[i]*pow(i,K,MOD))%MOD
	#print(ANS)
#print(ans)
ANS=(ANS*pow(pow(M,K,MOD),MOD-2,MOD))%MOD
print(ANS)