mod=10**9+7

n,k=map(int,input().split())
arr=list(map(int,input().split()))
dp=[[0]*10001 for _ in range(n+1)]
dp[0][0]=1
for val in arr:
    for i in range(n,0,-1):
        for j in range(10000,val-1,-1):
            dp[i][j]+=dp[i-1][j-val]
            dp[i][j]%=mod
ans=0
for i in range(1,n+1):
    for j in range(10001):
        if j>=i*k:
            ans+=dp[i][j]
            ans%=mod
print(ans)