MOD = 10 ** 9 + 7
N, K = map(int, input().split())
A = list(map(int,input().split()))
from collections import defaultdict
dic = defaultdict(int)
dic[(0,0)] = 1
for a in A:
    dic2 = defaultdict(int)
    for (x,y),v in dic.items():
        dic2[(x,y)] += v
        dic2[(x,y)] %= MOD
        dic2[(x+1,y+a)] += v
        dic2[(x+1,y+a)] %= MOD
    dic = dic2
ans = 0
for (x,y),v in dic.items():
    if y >= K * x:
        ans += v
        ans %= MOD
print(ans - 1)