// Slower C++ solution:
#include <bits/stdc++.h>

#define LOCAL

using namespace std;

template <typename A, typename B>

ostream& operator <<(ostream& out, const pair<A, B>& a) {

out << "(" << a.first << "," << a.second << ")";

return out;

}

template <typename T, size_t N>

ostream& operator <<(ostream& out, const array<T, N>& a) {

out << "["; bool first = true;

for (auto& v : a) { out << (first ? "" : ", "); out << v; first = 0;} out << "]";

return out;

}

template <typename T>

ostream& operator <<(ostream& out, const vector<T>& a) {

out << "["; bool first = true;

for (auto& v : a) { out << (first ? "" : ", "); out << v; first = 0;} out << "]";

return out;

}

template <typename T, class Cmp>

ostream& operator <<(ostream& out, const set<T, Cmp>& a) {

out << "{"; bool first = true;

for (auto& v : a) { out << (first ? "" : ", "); out << v; first = 0;} out << "}";

return out;

}

template <typename U, typename T, class Cmp>

ostream& operator <<(ostream& out, const map<U, T, Cmp>& a) {

out << "{"; bool first = true;

for (auto& p : a) { out << (first ? "" : ", "); out << p.first << ":" << p.second; first = 0;} out << "}";

return out;

}

#ifdef LOCAL

#define trace(...) __f(#__VA_ARGS__, __VA_ARGS__)

#else

#define trace(...) 42

#endif

template <typename Arg1>

void __f(const char* name, Arg1&& arg1){

cerr << name << ": " << arg1 << endl;

}

template <typename Arg1, typename... Args>

void __f(const char* names, Arg1&& arg1, Args&&... args){

const char* comma = strchr(names + 1, ',');

cerr.write(names, comma - names) << ": " << arg1 << " |";

__f(comma + 1, args...);

}

#define rep(i,n) for(int i=0; i<(n); i++)

using ll = long long;

#define int long long

using P = pair<int,int>;

//#########################################

int dp[55][3300][55];

signed main(){

	int n,a;cin >> n >> a;

	int x[n];

	rep(i,n)cin >> x[i];

	dp[0][0][0] = 1;

	rep(m,n+1){

		rep(i,n){

			rep(j,3000){

				int ni = i+1,nj = j+x[i];

				dp[i+1][j][m] += dp[i][j][m];

				dp[ni][nj][m+1] += dp[i][j][m];

			}

		}

	}

	int ans = 0;

	for(int i = 1;i <= n;i++){

		//trace(i,dp[n][a*i][i]);

		ans += dp[n][a*i][i];

	}

	cout << ans << endl;

	



	return 0;

}

// Faster C++ solution for the same problem (measured speedup: 2.628238836684316x):
#include <bits/stdc++.h>

#define LOCAL

using namespace std;

template <typename A, typename B>

ostream& operator <<(ostream& out, const pair<A, B>& a) {

out << "(" << a.first << "," << a.second << ")";

return out;

}

template <typename T, size_t N>

ostream& operator <<(ostream& out, const array<T, N>& a) {

out << "["; bool first = true;

for (auto& v : a) { out << (first ? "" : ", "); out << v; first = 0;} out << "]";

return out;

}

template <typename T>

ostream& operator <<(ostream& out, const vector<T>& a) {

out << "["; bool first = true;

for (auto& v : a) { out << (first ? "" : ", "); out << v; first = 0;} out << "]";

return out;

}

template <typename T, class Cmp>

ostream& operator <<(ostream& out, const set<T, Cmp>& a) {

out << "{"; bool first = true;

for (auto& v : a) { out << (first ? "" : ", "); out << v; first = 0;} out << "}";

return out;

}

template <typename U, typename T, class Cmp>

ostream& operator <<(ostream& out, const map<U, T, Cmp>& a) {

out << "{"; bool first = true;

for (auto& p : a) { out << (first ? "" : ", "); out << p.first << ":" << p.second; first = 0;} out << "}";

return out;

}

#ifdef LOCAL

#define trace(...) __f(#__VA_ARGS__, __VA_ARGS__)

#else

#define trace(...) 42

#endif

template <typename Arg1>

void __f(const char* name, Arg1&& arg1){

cerr << name << ": " << arg1 << endl;

}

template <typename Arg1, typename... Args>

void __f(const char* names, Arg1&& arg1, Args&&... args){

const char* comma = strchr(names + 1, ',');

cerr.write(names, comma - names) << ": " << arg1 << " |";

__f(comma + 1, args...);

}

#define rep(i,n) for(int i=0; i<(n); i++)

using ll = long long;

#define int long long

using P = pair<int,int>;

//#########################################

int dp[55][55][3000];

signed main(){

    int n,x;cin >>n >> x;

    vector<int> a(n);

    rep(i,n)cin >> a[i];

    dp[0][0][0] = 1;

    rep(i,n)rep(k,n+1)rep(j,3000){

        if(j+a[i] < 3000)dp[i+1][k+1][j+a[i]] += dp[i][k][j];

        dp[i+1][k][j] += dp[i][k][j];

    }

    int ret = 0;

    for(int i = 1;i <= n;i++){

        ret += dp[n][i][x*i];

    }

    cout << ret << endl;

    return 0;

}