#define _GLIBCXX_DEBUG
#include <bits/stdc++.h>

#include <atcoder/modint>
using namespace std;
using mint = atcoder::modint998244353;
using T = tuple<int, int, int>;

int main() {
	map<T, mint> memo;
	auto f = [&](auto f, int n, int m, int k) {
		if(memo.count(T(n, m, k))) return memo[T(n, m, k)];
		if(n == 0 or m < 0) return memo[T(n, m, k)] = (m ? 0 : 1);
		if(n * k < m) return memo[T(n, m, k)] = 0;
		return memo[T(n, m, k)] = f(f, n - 1, m, k) + f(f, n, m - n, k - 1);
	};

	int n, k;
	cin >> n >> k;
	vector a(n, 0), cnt(n, 0);
	for(auto& v : a) cin >> v;

	if(k > n * (n - 1) / 2) {
		puts("0");
		return 0;
	}

	sort(a.begin(), a.end());
	int now = 0;
	for(int i = 0; i < n - 1; i++) {
		cnt[now]++;
		if(a[i] != a[i + 1]) now++;
	}
	cnt[now]++;

	vector dp(n + 1, vector(k + 1, mint(0)));
	dp[0][0] = 1;
	int cum = 0;
	for(int i = 0; i < n; i++) {
		for(int j = 0; j <= k; j++)
			for(int l = 0; l <= min(cnt[i] * cum, j); l++)
				dp[i + 1][j] += dp[i][j - l] * f(f, cnt[i], l, cum);
		cum += cnt[i];
	}

	cout << dp.back()[k].val() << '\n';
	
	return 0;
}