import sys
input = sys.stdin.readline

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

DP=[0]*20010
DP[10005]=1

import copy

for a in A:
    NDP=copy.deepcopy(DP)

    for i in range(20010):
        if 0<=i+a<20010:
            NDP[i+a]+=DP[i]

    DP=NDP

print((sum(DP[10005:])-1)%(10**9+7))