#include <iostream>
#include <cstring>
#include <vector>
#include <set>
#include <map>
#include <sstream>
#include <cstdio>
#include <algorithm>
#include <stack>
#include <queue>
#include <cmath>
#include <iomanip>
#include <fstream>
using namespace std;

int main() {
int n,x,res=0;
bool nmz=false;
cin>>n>>x;
vector <int> v(n);
for (int i=0;i<n;i++){
    cin>>v[i];
}
sort( v.begin(),v.end());
    for (int i=0,j=n-1;i<=j;){
    if (v[i]+v[j]<=x){
        res++;
        i++;
        j--;
    }
    else if(v[i]+v[j]>x) {
        j--;
        res++;
    }


}
    cout <<res;


}