N,X=list(map(int,input().split()))
a=list(map(int,input().split()))

count=0

for i in range(N-1):
    for j in range(i,N):
          if(a[i]+a[j]==X):
            count+=1
            if(a[i]!=a[j]):
                count+=1
                
if(2*a[N-1]==X):
    count+=1
            
print(count)