N, K = map(int, input().split())
A = list(map(int, input().split()))
dp = [[[0]*10001 for _ in range(N+1)] for _ in range(N+1)]
dp[0][0][0] = 1
MOD = 10**9+7

for i in range(N):
    for j in range(N+1):
        for k in range(10001):
            dp[i+1][j][k] = (dp[i+1][j][k]+dp[i][j][k])%MOD
            
            if j+1<=N and k+A[i]<=10000:
                dp[i+1][j+1][k+A[i]] = (dp[i+1][j+1][k+A[i]]+dp[i][j][k])%MOD

tle = 0

for i in range(1, N+1):
    for j in range(10001):
        if j>=i*K:
            tle += dp[N][i][j]

print(tle)