#include <iostream>
#include <cstdint>
#include <cassert>

template<std::int_fast32_t Modulus>
struct modint {
	using value_type = std::int_fast32_t;

	static constexpr std::int_fast32_t mod = Modulus;
	static_assert(mod > 1, "Modulus must be greater than 1");

private :
	value_type x;

	template<class Tp>
	static constexpr value_type normalize (Tp value) noexcept {
		if (value < 0) {
			value = (-value) % mod;
			return (value ? value : mod - value);
		}
		return (value % mod);
	}

public :
	explicit constexpr modint () noexcept : x(0) { }

	template<class Tp>
	constexpr modint (Tp value) noexcept : x(normalize(value)) { }

	constexpr modint operator+ () const noexcept {
		return modint(*this);
	}

	constexpr modint operator- () noexcept {
		if (x != 0) x = mod - x;
		return modint(*this);
	}

	constexpr modint &operator+= (const modint &p) noexcept {
		if ((x += p.x) >= mod) x -= mod;
		return (*this);
	}

	constexpr modint &operator-= (const modint &p) noexcept {
		if ((x += mod - p.x) >= mod) x -= mod;
		return (*this);
	}

	constexpr modint &operator*= (const modint &p) noexcept {
		x = (int)(1LL * x * p.x % mod);
		return (*this);
	}

	constexpr modint &operator/= (const modint &p) noexcept {
		return ((*this) *= p.inverse());
	}

	constexpr modint operator+ (const modint &p) const noexcept {
		return (modint(*this) += p);
	}

	constexpr modint operator- (const modint &p) const noexcept {
		return (modint(*this) -= p);
	}

	constexpr modint operator* (const modint &p) const noexcept {
		return (modint(*this) *= p);
	}

	constexpr modint operator/ (const modint &p) const noexcept {
		return (modint(*this) /= p);
	}

	constexpr bool operator== (const modint &p) const noexcept {
		return (x == p.x);
	}

	constexpr bool operator!= (const modint &p) const noexcept {
		return (x != p.x);
	}

	template<class Tp>
	constexpr modint pow (Tp exp) const noexcept {
		modint value(1), buff(x);
		while (exp) {
			if (exp & 1) value *= buff;
			buff *= buff;
			exp >>= 1;
		}
		return value;
	}

	constexpr modint inverse () const noexcept {
		return pow(mod - 2);
	}

	friend std::ostream &operator<< (std::ostream &os, const modint &p) {
		return (os << p.x);
	}

	friend std::istream &operator>> (std::istream &is, modint &p) {
		long long v;
		is >> v;
		p = modint(v);
		return (is);
	}

};


#include <iostream>
#include <cstddef>
#include <vector>

using usize = std::size_t;
using i32 = std::int_fast32_t;
template<class T>
using matrix = std::vector<std::vector<T>>;

constexpr std::int_fast32_t MOD = 1000000007;
constexpr usize MAX = 10010;

int main() {
	usize n, k;
	std::cin >> n >> k;
	std::vector<usize> a(n);
	for (usize i = 0; i < n; i++) {
		std::cin >> a[i];
	}
	
	matrix<modint<MOD>> dp(n + 1, std::vector<modint<MOD>>(MAX, 0));
	matrix<modint<MOD>> next(n + 1, std::vector<modint<MOD>>(MAX, 0));
	dp[0][0] = next[0][0] = 1;
	for (usize i = 0; i < n; i++) {
		for (usize j = 0; j < n; j++) {
			for (usize k = 0; k + a[i] < MAX; k++) {
				next[j + 1][k + a[i]] += dp[j][k];
			}
		}
		dp = next;
	}
	
	modint<MOD> ans = 0;
	for (usize i = 1; i <= n; i++) {
		for (usize j = i * k; j < MAX; j++) {
			ans += dp[i][j];
		}
	}
	
	std::cout << ans << '\n';
	
	return 0;
}