n,k=map(int, input().split())
*a,=map(int, input().split())
mod=10**9+7

dp=[[0]*(100*100+1) for _ in range(n+1)]
# dp[ここまで選んだ人数][点数]
dp[0][0]=1

for i in range(n):
    for j in range(i+1, 0,-1):
        for score in range(j*100+1):
            dp[j][score+a[i]]+=dp[j-1][score]
            dp[j][score+a[i]]%=mod
            

ans=0
for i in range(n):
    ans+=sum(dp[i+1][k*(i+1):])
    ans%=mod
print(ans)
#print(dp[1][:101])