#include <iostream>
#include <vector>
using namespace std;
int main() {
    int n,m; cin >> n >> m;
    vector<int> a, b;
    int ans = 0;
    for (int i = 0; i < n; i++) {
        int _a, _b; cin >> _a >> _b;
        if (_b < _a) {
            int temp = _a;
            _a = _b;
            _b = temp;
        }
        a.push_back(_a);
        b.push_back(_b);
        for (int k = 0; k < i; k++) {
            if ((a[k] < _a && _a < b[k]) && (a[k] < _b && _b < b[k])) {
                continue;
            }
            if ((a[k] < _a && _a < b[k]) || (a[k] < _b && _b < b[k])) {
                ans++;
            }
        }
    }
    cout << ans << endl;
    return 0;
}