#include <iostream>
#include <algorithm>
#include <vector>
using namespace std;
int main()
{
ios_base::sync_with_stdio(false);
cin.tie(NULL);
int n,k;
cin>>n>>k;
long long sum=0;
int i,j,count=0;
vector<int> hardness;
for(i=0;i<n;i++){
int data;
cin>>data;
hardness.push_back(data);
}
sort(hardness.begin(),hardness.end());
for(i=0;i<n-1;i++){
for(j=i+1;j<n;j++){
sum=hardness[i]+hardness[j];
if(sum>=k)break;
else ++count;
}
}
cout<<count;
return 0;
}
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