MOD = 10**9 + 7
N, K = map(int, input().split())
A = list(map(int, input().split()))

t = 100 * N
dp = [[0] * (t+1) for _ in range(N+1)]
dp[0][0] = 1
for i in range(N):
    s = A[i]
    for j in reversed(range(N)):
        for k in range(t+1):
            if dp[j][k] == 0: continue
            dp[j+1][k+s] += dp[j][k]
            dp[j+1][k+s] %= MOD

ans = 0
for i in range(1, N+1):
    for j in range(i * K, t+1):
        ans += dp[i][j]
        ans %= MOD

print(ans)