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

d={}
for i in a:
    d[i]=0
for i in a:
    d[i]+=1

count=0
for i in d.keys():
    if(i<=X and X-i in d):
        if(2*i==X):
            count+=d[i]+d[i]*(d[i]-1)
        else:
            count+=d[X-i]*d[i]
print(count)