#include <bits/stdc++.h>
using namespace std;
using i64 = int64_t;
using vi = vector<i64>;
using vvi = vector<vi>;
using ii = pair<int, int>;

class BIT {
    int n;
    vi data;

    i64 sum(int i) {
        i64 s = 0;
        while (i > 0) {
            s += data[i];
            i -= i & -i;
        }
        return s;
    }

public:
    BIT(int n) : n(n) {
        data = vi(n + 1);
    }

    void add(int i, i64 x) {
        i++;
        while (i <= n) {
            data[i] += x;
            i += i & -i;
        }
    }

    // [l, r)
    i64 sum(int l, int r) {
        return sum(r) - sum(l);
    }
};

int main() {
    int n, m;
    cin >> n >> m;
    vector<ii> vs;
    for (int i = 0; i < n; i++) {
        int a, b;
        cin >> a >> b;
        vs.push_back(ii(min(a, b), max(a, b)));
    }
    sort(vs.begin(), vs.end());

    BIT bit(m);
    i64 cnt = 0;
    for (ii& p: vs) {
        cnt += bit.sum(p.first, p.second);
        bit.add(p.second, 1);
    }
    cout << cnt << endl;
}