#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
#define rep(i, n) for(int i=0;i<(n);++i)
#define rep1(i, n) for(int i=1;i<=(n);i++)
#define ll long long
using mint = modint998244353;
using P = pair<ll,ll>;
using lb = long double;
using T = tuple<ll, ll, ll>;
#ifdef LOCAL
#  include <debug_print.hpp>
#  define dbg(...) debug_print::multi_print(#__VA_ARGS__, __VA_ARGS__)
#else
#  define dbg(...) (static_cast<void>(0))
#endif

int main()
{
    int n, m, k;
    cin >> n >> m >> k;
    vector<int> a(m);
    rep(i,m) cin >> a[i];
    vector<int> ds(1e6+1);
    rep(i,m) ds[a[i]]++;
    mint ans = 0;
    mint inv = mint(m).pow(k).inv();
    vector<mint> Pow(m+1);
    for(int i=1;i<=m;i++) Pow[i] = mint(i).pow(k);
    vector<int> cnt(n+1);
    for(int i=1;i<=1e6;i++) {
        for(int j=i;j<=n;j+=i) cnt[j] += ds[i];
    }
    for(int i=1;i<=n;i++) {
        ans += 1 - Pow[m-cnt[i]] * inv;
    }
    cout << ans.val() << endl;
    return 0;
}