import collections
N,K = map(int,input().split())
A = list(map(int,input().split()))
mod = 10**9+7
DP = [collections.defaultdict(int) for _ in range(N+1)]
DP[0][0]=1
for a in A:
    for i in reversed(range(N)):
        for k,v in DP[i].items():
            DP[i+1][k+a] = (DP[i+1][k+a]+v) % mod
ans = 0
for i in range(1,N+1):
    for k,v in DP[i].items():
        if k>=K*i:
            ans+=v
print(ans%mod)