#include <bits/stdc++.h>
using namespace std;
 
void executeTime() {
    cerr << "Time Taken: " << (float)clock() / CLOCKS_PER_SEC << " secs";
}
 
int main() {
 
 
    int n, t; cin >> n >> t;
 
    vector<int> v(n);
 
    for (auto &x : v) {
        cin >> x;
    }
 
    int c = 0;
    unordered_map<int, int> mp;
    for (auto &x : v) {
        if (mp[t - x]) {
            c++;
        }
 
        mp[x]++;
    }
 
    cout << c << endl;
 
    executeTime();
    return 0;
}

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

MTAgNQoxIDIzIDMgNyA1MAo0IDMyIDIgNCA1MAo=

10 5
1 23 3 7 50
4 32 2 4 50