from collections import Counter

N,M,K=map(int,input().split())
A=list(map(int,input().split()))

mod=998244353

C=Counter(A)

LIST=[0]*(N+1)

for c in C:
    for i in range(c,N+1,c):
        LIST[i]+=C[c]
        
ANS=0
INV=pow(M,mod-2,mod)

for i in range(1,N+1):
    x=LIST[i]

    ANS+=pow((M-x)*INV,K,mod)
    ANS%=mod

print((N-ANS)%mod)