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

const ULL M=1000000007;
const int Z=20001;
ULL dp[Z] = {};
ULL dpb[Z] = {};

int main() {
 int N,K; scanf("%d%d",&N,&K);
 int A[100]; rep(i,N){ scanf("%d",&A[i]); A[i]-=K; }
 dp[Z/2]=1;
 rep(i,N){
  rep(i,Z) dpb[i]=dp[i];
  for(int j=100; j<Z-100; j++)
   dp[j+A[i]] += dpb[j];
  if((N-i)%16==1) dp[i]%=M;
 }
 ULL ans=0;
 rep(i,Z/2) ans+=dp[Z/2+i];
 ans %= M;
 cout<<(ans-1)<<endl;
 return 0;
}