MOD = 10**9 + 7


def solve():
    n, k = map(int, input().split())
    a = list(map(int, input().split()))
    dp = [[0]*(40010) for i in range(110)]
    dp[0][10000] = 1
    for i, score in enumerate(a):
        v = score - k
        for j in range(20010):
            dp[i + 1][j] = (dp[i][j] + dp[i][j - v]) % MOD
    ans = sum(dp[n][s] for s in range(10000, 20010)) % MOD
    ans = (ans - 1)%MOD
    print(ans)
    return


solve()