import sys
from collections import defaultdict
def MI(): return map(int,sys.stdin.readline().rstrip().split())
def LI(): return list(map(int,sys.stdin.readline().rstrip().split()))


N,K = MI()
A = LI()
for i in range(N):
    A[i] -= K
mod = 10**9+7
A = [0]+A

# 和が0以上になる選び方を数え上げる

dp = defaultdict(int)  # dp[(i,j)] = 生徒1~iの中から選ぶ時、和がjになるような選び方
dp[(0,0)] = 1
for i in range(1,N+1):
    a = A[i]
    for j in range(-10000,10001):
        dp[(i,j)] = dp[(i-1,j)]+dp[(i-1,j-a)]
        dp[(i,j)] %= mod

ans = -1
for i in range(10001):
    ans += dp[(N,i)]
    ans %= mod

print(ans)