#include<stdio.h> 
#include<math.h>
#include<stdlib.h> 
 
 
struct point 
{ 
    
long long inf,s1,s2,s3; 
    
point *leg; 
}; 
 
 
point *qq,*p,*s[676530]; 
int qqq,y,i,j,k,n; 
long long suma,sum,nr,a[1024];
 
 
void verif(long long q,long long y) 
{ 

	qq=new point;  
   
	qq=s[q%(y+1)];   
    
	while (qq!=NULL)    
	{ 
		if (qq->inf==q); 
				if (qq->s1!=s[i]->s1)
					if (qq->s1!=s[i]->s2)
						if (qq->s2!=s[i]->s1)
							if (qq->s2!=s[i]->s2)
								if (qq->s1!=qq->s2)
									if (s[i]->s1!=s[i]->s2)
							
										nr++; 
						
	qq=qq->leg;     
	}
}
 
void hash(long long x,long long y) 
{

	p=new point; 
	p->inf=x;     

	p->s1=i;
	p->s2=j;
    
	p->leg=s[x%(y+1)];      
	s[x%(y+1)]=p; 
} 
 
 
int main() 
{ 
	freopen("oite.in","r",stdin); 
	freopen("oite.out","w",stdout); 
	
	scanf("%d%lld",&n,&sum); 
	
	for (i=1;i<=n;i++) 
		//{
			
				//nr++;
			//}
			scanf("%lld",&a[i]); 
	//}
	for (i=0;i<=676515;i++)
		s[i]=NULL;
    
 
for (i=1;i<=n-1;i++) 
for (j=i+1;j<=n;j++) 
	{                
		suma=a[i]+a[j];                
		hash(suma,(suma%676513));            
}             
 
 
    
qqq=0; 
     
for (i=0;i<=676514;i++) 
        
	while (s[i]!=NULL) 
        
{        
			if (sum-s[i]->inf>0) verif(sum-s[i]->inf,(sum-s[i]->inf)%676513);           
			s[i]=s[i]->leg;         
		}          

	
printf("%lld",nr/3);  

return 0; 
}