#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using ll = long long;
using mint = atcoder::modint998244353;

int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    short n, m;
    int k;
    cin >> n >> m >> k;
    vector<int> a(n);
    for(auto &&v : a) cin >> v;
    sort(a.begin(), a.end());
    vector<pair<short,short>> b(n);
    for(short i = 0, l = 0, r = 0; i < n; i++){
        while(l < n && a[l] < a[i] - k) l++;
        while(r < n && a[r] <= a[i] + k) r++;
        b[i] = make_pair(l, r);
    }
    vector<mint> dp(n + 1), ndp(n + 1);
    iota(dp.begin(), dp.end(), mint::raw(0));
    for(short i = 1; i < m; i++){
        for(short j = 0; j < n; j++){
            ndp[j + 1] = ndp[j] + dp[b[j].second] - dp[b[j].first];
        }
        swap(dp, ndp);
    }
    cout << dp[n].val() << '\n';
}