#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
#include <cstdio>
#include <cstring>
#include <cmath>
using namespace std;
using ll = long long;

struct BIT {
    BIT(int n) : b(n + 1), n(n) {}
    void add(int i, int v) {
        for (int k = i + 1; k <= n; k += k & -k) b[k] += v;
    }
    int sum(int k) {
        int s = 0;
        for (; k > 0; k -= k & -k) s += b[k];
        return s;
    }
    vector<int> b;
    int n;
};

struct E {
    bool operator<(const E& e) const {
        return a < e.a;
    }
    int a, b;
};

int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);

    int n, m;
    cin >> n >> m;

    vector<E> e(n);
    for (int i = 0; i < n; i++) {
        int a, b;
        cin >> a >> b;
        if (a > b) swap(a, b);
        e[i] = { a, b };
    }
    sort(e.begin(), e.end());

    BIT bt(m);
    ll r = 0;
    for (int i = 0; i < n; i++) {
        r += bt.sum(e[i].b) - bt.sum(e[i].a);
        bt.add(e[i].b, 1);
    }

    cout << r << endl;

    return 0;
}