"""

dp[i][j] = i人いて、合計がj点の選び方
100*100*100

"""

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

ans = 0
mod = 10**9+7

dp = [ [0] * (N*100+1) for i in range(N+1) ]
dp[0][0] = 1

for a in A:

    for i in range(N-1,-1,-1):

        for j in range(N*100+1):

            if j+a < N*100+1:
                dp[i+1][j+a] += dp[i][j]
                dp[i+1][j+a] %= mod

for i in range(1,N+1):

    for j in range(N*100+1):

        if i*K <= j:
            ans += dp[i][j]

print (ans % mod)