mod = 1000000007
eps = 10**-9


def main():
    import sys
    input = sys.stdin.readline

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

    B = [a - K for a in A]
    dp = [[0] * (20010) for _ in range(N+1)]
    dp[0][0] = 1
    for i, b in enumerate(B):
        for j in range(-10000, 10001):
            dp[i+1][j] = (dp[i+1][j] + dp[i][j])%mod
            if -10000 <= j+b <= 10000:
                dp[i+1][j+b] = (dp[i+1][j+b] + dp[i][j])%mod
    ans = 0
    for j in range(10001):
        ans = (ans + dp[-1][j])%mod
    print(ans - 1)


if __name__ == '__main__':
    main()