import sys
input = sys.stdin.readline
N, K = map(int, input().split())
a = list(map(int, input().split()))
mod = 10 ** 9 + 7
a.sort()
for i in range(N): a[i] -= K
mn = []
zr = 0
pl = []
for x in a:
  if x < 0: mn.append(-x)
  elif x == 0: zr += 1
  else: pl.append(x)

dpmn = [0] * (N * 100 + 1)
dpmn[0] = 1
dppl = [0] * (N * 100 + 1)
dppl[0] = 1
for x in mn:
  for i in range(N * 100, -1, -1):
    if dpmn[i]:
      dpmn[i + x] += dpmn[i]
      dpmn[i + x] %= mod
for x in pl:
  for i in range(N * 100, -1, -1):
    if dppl[i]:
      dppl[i + x] += dppl[i]
      dppl[i + x] %= mod
for i in range(N * 100, 0, -1):
  dppl[i - 1] += dppl[i]
  dppl[i - 1] %= mod
res = -1
for i in range(N * 100 + 1):
  res += dppl[i] * dpmn[i] * (zr + 1)
  res %= mod
print(res)