#include<bits/stdc++.h>

using namespace std;

#define inf 0x3f3f3f3f

#define ll long long

const int N=55;

const int mod=1e9+7;

const double eps=1e-8;

const double PI = acos(-1.0);

#define lowbit(x) (x&(-x))

ll dp[N][N*N];

int main()

{

    std::ios::sync_with_stdio(false);

    int n,a;

    cin>>n>>a;

    dp[0][0]=1;

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

    {

        int x;

        cin>>x;

        for(int j=i-1;j>=0;j--)

        for(int w=0;w<=N*j;w++)

        {

            dp[j+1][w+x]+=dp[j][w];

         //   cout<<j+1<<" "<<w+x<<" "<<dp[j+1][w+x]<<endl;

        }

    }

    ll ans=0;

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

    {

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

    }

    cout<<ans<<endl;

    return 0;

}