import sys

sys.setrecursionlimit(200005)
int1 = lambda x: int(x)-1
p2D = lambda x: print(*x, sep="\n")
def II(): return int(sys.stdin.readline())
def LI(): return list(map(int, sys.stdin.readline().split()))
def LI1(): return list(map(int1, sys.stdin.readline().split()))
def LLI(rows_number): return [LI() for _ in range(rows_number)]
def LLI1(rows_number): return [LI1() for _ in range(rows_number)]
def SI(): return sys.stdin.readline().rstrip()
# dij = [(0, 1), (-1, 0), (0, -1), (1, 0)]
dij = [(0, 1), (-1, 0), (0, -1), (1, 0), (1, 1), (1, -1), (-1, 1), (-1, -1)]
inf = 10**9
# md = 998244353
md = 10**9+7

mx = 10000

n, k = LI()
aa = LI()
aa = [a-k for a in aa]
dp = [0]*(mx*2+5)
dp[0] = 1
for a in aa:
    if a >= 0: s, t, d = mx, -mx, -1
    else: s, t, d = -mx, mx, 1
    for j in range(s, t, d):
        if j+a > mx or j+a < -mx: continue
        dp[j+a] += dp[j]
        dp[j+a] %= md

ans = -1
for j in range(mx):
    ans += dp[j]
    ans %= md

print(ans)