#define MD 998244353
ll@N,@M,@K,@A[M];
Mint ans = 0;
ll cnt[N+1];
rep(i,N+1)cnt[i]=0;
rep(i, M) rep(j, A[i], N + 1, A[i]) cnt[j]++;
rep(i, 1, N+1) {
    ans += 1;
    Mint t = M-cnt[i];
    Mint s = M;
    ans -= (t/s).pw(K);
}
wt(ans);