import cmath
import math

def fft(x):
    N = len(x)
    if N <= 1:
        return x
    even = fft(x[0::2])
    odd = fft(x[1::2])
    T = [cmath.exp(-2j * cmath.pi * k / N) * odd[k] for k in range(N // 2)]
    return [even[k] + T[k] for k in range(N // 2)] + [even[k] - T[k] for k in range(N // 2)]

def ifft(x):
    N = len(x)
    if N <= 1:
        return x
    even = ifft(x[0::2])
    odd = ifft(x[1::2])
    T = [cmath.exp(2j * cmath.pi * k / N) * odd[k] for k in range(N // 2)]
    return [(even[k] + T[k]) / 2 for k in range(N // 2)] + [(even[k] - T[k]) / 2 for k in range(N // 2)]

def convolve(a, b):
    s = len(a) + len(b) - 1
    t = 1
    while t < s:
        t *= 2
    a = a + [0] * (t - len(a))
    b = b + [0] * (t - len(b))
    
    A = fft(a)
    B = fft(b)
    
    C = [A[i] * B[i] for i in range(t)]
    
    c = ifft(C)
    
    return [x.real for x in c[:s]]

n,x=map(int,input().split())
A=list(map(int,input().split()))

f=[0]*(10*5+1)
for a in A:
    f[a]+=1
    
f=convolve(f,f)
print(int(f[x]))