#include<bits/stdc++.h>
using namespace std;
using ULL = unsigned long long;
#define rep(i,n) for(int i=0; i<(n); i++)

const ULL M=1000000007;
const int Z=40001;
ULL dp[Z] = {};
ULL dpb[Z] = {};

int main() {
 int N,K; cin>>N>>K;
 int A[100]; rep(i,N){ cin>>A[i]; A[i]-=K; }
 dp[Z/2]=1;
 rep(i,N){
  rep(i,Z) dpb[i]=dp[i]%M;
  for(int j=100; j<Z-100; j++)
   dp[j+A[i]] += dpb[j];
 }
 ULL ans=0;
 rep(i,Z/2) ans+=dp[Z/2+i];
 ans %= M;
 cout<<(ans-1)<<endl;
 return 0;
}