n,m,k=map(int,input().split())
a=list(map(int,input().split()))
M=998244353
L=10**6
c=[0]*(L+1)
for v in a:
  c[v]+=1
p=[0]*(n+1)
for i in range(1,n+1):
  for j in range(i,n+1,i):
    p[j]+=c[i]
e=0
im=pow(m,M-2,M)
for i in range(1,n+1):
  e+=pow((m-p[i])*im,k,M)
  e%=M
print((n-e)%M)