N, K = map(int, input().split())
A = list(map(int, input().split()))

mod = 10**9+7
dp = [[[0]*10001 for _ in range(N+1)] for _ in range(N+1)]
dp[0][0][0] = 1
res = 0
for i in range(1, N+1):
    for j in range(N+1):
        for k in range(10001):
            dp[i][j][k] += dp[i-1][j][k]
            dp[i][j][k] %= mod
            if j > 0 and k+A[i-1] <= 10000:
                dp[i][j][k+A[i-1]] += dp[i-1][j-1][k]
                dp[i][j][k+A[i-1]] %= mod
            if i == N and j > 0 and k >= j*K:
                res += dp[i][j][k]
                res %= mod

print(res)