#include<bits/stdc++.h>
#define ll long long
using namespace std;
const int N=2500;
ll dp[55][5005];
int n,m,x,y;
int main()
{
	cin>>n>>m;
	dp[0][2500]=1;
	for(int i=1;i<=n;i++)
	{
		cin>>x;
		y=x-m;
		for(int j=0;j<=5000;j++)
		{
			dp[i][j]+=dp[i-1][j];
			if(j+y<0||j+y>5000)continue;
			dp[i][j+y]+=dp[i-1][j];
		}
	}
	cout<<dp[n][2500]-1<<endl;
	return 0;
}