#include<bits/stdc++.h>
namespace {
#pragma GCC diagnostic ignored "-Wunused-function"
#include<atcoder/all>
#pragma GCC diagnostic warning "-Wunused-function"
using namespace std;
using namespace atcoder;
#define rep(i,n) for(int i = 0; i < (int)(n); i++)
#define rrep(i,n) for(int i = (int)(n) - 1; i >= 0; i--)
#define all(x) begin(x), end(x)
#define rall(x) rbegin(x), rend(x)
template<class T> bool chmax(T& a, const T& b) { if (a < b) { a = b; return true; } else return false; }
template<class T> bool chmin(T& a, const T& b) { if (b < a) { a = b; return true; } else return false; }
using ll = long long;
using P = pair<int,int>;
using VI = vector<int>;
using VVI = vector<VI>;
using VL = vector<ll>;
using VVL = vector<VL>;
using mint = modint998244353;

template<class T>
vector<T> divisors(T x) {
  vector<T> res1, res2;
  T d = 1;
  for(; d * d < x; d++) {
    if (x % d == 0) {
      res1.emplace_back(d);
      res2.emplace_back(x / d);
    }
  }
  if (d * d == x) res1.emplace_back(d);
  res1.insert(res1.end(), res2.rbegin(), res2.rend());
  return res1;
}

} int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  int n, m;
  cin >> n >> m;
  VI a(n);
  rep(i, n) cin >> a[i];
  int l = 1;
  for(int x: a) l = lcm(l, x);
  auto divs = divisors(l);
  int sz = divs.size();
  vector<mint> dp(sz);
  rep(i, sz) {
    int d = divs[i];
    mint v = 1;
    for(int x: a) {
      int g = gcd(x, d);
      v *= mint(m).pow(g);
    }
    dp[i] = v;
  }
  rep(i, sz) rep(j, i) {
    if (divs[i] % divs[j] == 0) {
      dp[i] -= dp[j];
    }
  }
  mint ans;
  rep(i, sz) ans += dp[i] / divs[i];
  cout << ans.val() << '\n';
}