N, K = map(int, input().split())
A = [int(a) - K for a in input().split()]
NE = [-a for a in A if a < 0]
PO = [a for a in A if a > 0]
ze = A.count(0)

M = 10001
POX = [0] * M
POX[0] = 1
for a in PO:
    for i in range(a, M)[::-1]:
        POX[i] += POX[i-a]

NEX = [0] * M
NEX[0] = 1
for a in NE:
    for i in range(a, M)[::-1]:
        NEX[i] += NEX[i-a]

ans = 1
for i in range(1, M):
    NEX[i] += NEX[i-1]
for i in range(1, M):
    ans += POX[i] * NEX[i]
ans *= 2 ** ze
ans -= 1
print(ans % (10 ** 9 + 7))