// Slower C++ solution:
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 ***         |          |____________|  |/  en ***

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 *** _____   |          |            |  |  \   ***

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 ***    \___/           |            |  |     \***

 *************************************************

 *************Written by: JiangHaoKai*************

 *************************************************/

#pragma GCC optimize(2)

#pragma G++ optimize(2)



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

#include <cassert>

#include <cctype>

#include <cerrno>

#include <cfloat>

#include <climits>

#include <clocale>

#include <cmath>

#include <csetjmp>

#include <csignal>

#include <cstdarg>

#include <cstddef>

#include <cstdio>

#include <cstdlib>

#include <cstring>

#include <ctime>

#include <ccomplex>

#include <cfenv>

#include <cinttypes>

#include <cstdalign>

#include <cstdbool>

#include <cstdint>

#include <ctgmath>

#include <cwchar>

#include <cwctype>

#include <algorithm>

#include <bitset>

#include <complex>

#include <deque>

#include <fstream>

#include <functional>

#include <iomanip>

#include <iostream>

#include <limits>

#include <list>

#include <locale>

#include <map>

#include <memory>

#include <numeric>

#include <queue>

#include <set>

#include <sstream>

#include <stack>

#include <stdexcept>

#include <string>

#include <typeinfo>

#include <valarray>

#include <vector>

#include <array>

#include <atomic>

#include <chrono>

#include <condition_variable>

#include <forward_list>

#include <future>

#include <mutex>

#include <random>

#include <ratio>

#include <regex>

#include <scoped_allocator>

#include <system_error>

#include <thread>

#include <tuple>

#include <typeindex>

#include <unordered_map>

#include <unordered_set>

//#include <conio.h>

//#include <windows.h>

using namespace std;



typedef long long LL;

typedef unsigned int ui;

typedef unsigned long long ull;

typedef float fl;

typedef double ld;

typedef pair<int,int> pii;

#define ui(n) ((unsigned int)(n))

#define ll(n) ((long long)(n))

#define ull(n) ((unsigned long long)(n))

#define fl(n) ((float)(n))

#define ld(n) ((double)(n))

#define char(n) ((char)(n))

#define Bool(n) ((bool)(n))

#define fixpoint(n) fixed<<setprecision(n)

const int INF=1061109567;

const LL LINF=4557430888798830399;

#define PI 3.1415926535897932384626433832795028841971

#define MP make_pair

#define MT make_tuple

#define All(a) (a).begin(),(a).end()

#define pall(a) (a).rbegin(),(a).rend()

#define mod 1000000007

#define sz(a) ((int)(a).size())

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

#define rep1(i,n) for(int i=1;i<=n;i++)

#define repa(i,a,n) for(int i=a;i<n;i++)

#define repa1(i,a,n) for(int i=a;i<=n;i++)

#define repd(i,n) for(int i=n-1;i>=0;i--)

#define repd1(i,n) for(int i=n;i>=1;i--)

#define repda(i,n,a) for(int i=n;i>a;i--)

#define repda1(i,n,a) for(int i=n;i>=a;i--)

#define FOR(i,a,n,step) for(int i=a;i<n;i+=step)

#define repv(itr,v) for(__typeof((v).begin()) itr=(v).begin();itr!=(v).end();itr++)

#define repV(i,v) for(auto i:v)

#define repE(i,v) for(auto &i:v)

#define MS(x,y) memset(x,y,sizeof(x))

#define MC(x) MS(x,0)

#define MCP(x,y) memcpy(x,y,sizeof(y))

#define sqr(x) ((x)*(x))

#define filein(x) freopen(x,"r",stdin)

#define fileout(x) freopen(x,"w",stdout)

#define fileout2(filename,name) ofstream name(filename,ios::out)

#define filein2(filename,name) ifstream name(filename,ios::in)

#define file(filename,name) fstream name(filename,ios::in|ios::out)

#define Pause system("pause")

#define Cls system("cls")

#define fs first

#define sc second

#define PC(x) putchar(x)

#define GC(x) x=getchar()

#define Endl PC('\n')

#define SF scanf

#define PF printf



inline int Read()

{

    int X=0,w=0;char ch=0;while(!isdigit(ch)){w|=ch=='-';ch=getchar();}while(isdigit(ch))X=(X<<3)+(X<<1)+(ch^48),ch=getchar();

	return w?-X:X;

}

inline void Write(int x){if(x<0)putchar('-'),x=-x;if(x>9)Write(x/10);putchar(x%10+'0');}



inline LL powmod(LL a,LL b){LL res=1;a%=mod;assert(b>=0);for(;b;b>>=1){if(b&1)res=res*a%mod;a=a*a%mod;}return res;}

inline LL gcdll(LL a,LL b){return b?gcdll(b,a%b):a;}

const int dx[]={0,1,0,-1,1,-1,-1,1};

const int dy[]={1,0,-1,0,-1,-1,1,1};

/**************************************************************Begin***************************************************************/

const int maxn=55;



LL n,a,x[maxn],dp[maxn][maxn*maxn*2];



int main()

{

	SF("%d%d",&n,&a);

	rep1(i,n) SF("%lld",&x[i]),x[i]-=a;

	

	dp[0][2500]=1;

	rep(i,n+1) rep(j,2500*2) dp[i+1][j+x[i+1]]+=dp[i][j],dp[i+1][j]+=dp[i][j];

	

	PF("%lld",dp[n][2500]-1);



	return 0;

}

/***************************************************************End****************************************************************/


// Faster C++ solution for the same problem (measured speedup: 1.2340524548563638x):
#include<iostream>

#include<cstring>

#include<queue>

#include<algorithm>

#include<cstdio>

using namespace std;

long long dp[60][60][2551];

int main(){

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

	int n,a,x[60],i,j,k;

	cin>>n>>a;

	for(i=0;i<n;i++) scanf("%lld",x+i);

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

		for(j=i;j>=0;j--){

			for(k=a*n+1;k>=0;k--){

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

                if(k>=x[i-1] && j>=1)

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

			}

		}

	}

	long long ans=0;

	for(int i=1;i<=n;i++) ans+=dp[n][i][a*i];

	printf("%lld",ans);

	return 0;

}