n,k = map(int, input().split())
A = list(map(int, input().split()))
A = [a-k for a in A]

maxa = 10**4+5
mod = 10**9+7
dp = [[0]*(2*maxa+1) for i in range(n+1)]
dp[0][maxa] = 1
for i, a in enumerate(A):
    for j in range(2*maxa+1):
        dp[i+1][j] = dp[i][j]
    for j in range(2*maxa+1):
        if 0 <= j+a < 2*maxa+1:
            dp[i+1][j+a] += dp[i][j]
            dp[i+1][j+a] %= mod

ans = 0
for i in range(maxa, 2*maxa+1):
    ans += dp[n][i]
    ans %= mod
ans -= 1
ans %= mod
print(ans)