# coding: utf-8
# Your code here!
N,K=map(int,input().split())
A=list(map(int,input().split()))

ans=0
dp=[[0]*10001 for i in range(N+1)]
dp[0][0]=1

for a in A:
    for n in range(N)[::-1]:
        for i in range(10001)[::-1]:
            if a+i<=10000:
                dp[n+1][a+i]+=dp[n][i]

for n in range(1,N+1):
    ans+=sum(dp[n][n*K:])

print(ans%(10**9+7))