#nullable enable

using System.Numerics;

#region
var (_input, _iter) = (Array.Empty<string>(), 0);
string String()
{
    while (_iter >= _input.Length) (_input, _iter) = (Console.ReadLine()!.Split(' '), 0);
    return _input[_iter++];
}
T I<T>() where T : IParsable<T> => T.Parse(String(), null);
#endregion

static T[] Range<T>(int n, Func<T> F) => Enumerable.Range(0, n).Select(_ => F()).ToArray();

var n = I<int>();
var mz = Range(n, () => (I<uint>(), I<uint>(), 1L));
var max = 1U << 20;
long Solve(int l, int r)
{
    if (r - l <= 32)
    {
        var res = 0L;
        for (var i = l; i < r; i++)
        {
            var (l1, r1, _) = mz[i];
            for (var j = i + 1; j < r; j++)
            {
                var (l2, r2, _) = mz[j];
                if (l1 < l2 && r2 < r1) res++;
            }
        }
        return res;
    }
    var mid = (l + r) >> 1;
    var v = 0L;
    v += Solve(l, mid);
    var k = mid - l;
    var points = new (uint, uint, long)[k];
    for (var i = 0; i < k; i++) points[i] = mz[i + l];
    var map = new PointMap(points);
    for (var i = mid; i < r; i++)
    {
        var (x, y, _) = mz[i];
        v += map.Sum((0, y), (x, max));
    }
    v += Solve(mid, r);
    return v;
}
var ans = Solve(0, n);
Console.WriteLine(ans);

class WaveletMatrix<T> where T : IAdditionOperators<T, T, T>, ISubtractionOperators<T, T, T>, IAdditiveIdentity<T, T>
{
    const int d = 21;
    uint[,] Rank0 { get; init; }
    T[,] Sum { get; init; }
    int Length => Rank0.GetLength(1) - 1;

    public WaveletMatrix((uint, T)[] array)
    {
        var n = array.Length;
        var ranks = new uint[d, n + 1];
        var sum = new T[d, n + 1];
        var a = array.AsSpan();
        var b = new (uint, T)[n].AsSpan();
        var a0 = new (uint, T)[n].AsSpan();
        var a1 = new (uint, T)[n].AsSpan();
        for (var i = d - 1; i >= 0; i--)
        {
            var (i0, i1) = (0, 0);
            for (var j = 0; j < n; j++)
            {
                ranks[i, j + 1] += ranks[i, j];
                var v = a[j];
                if ((v.Item1 & (1U << i)) > 0)
                {
                    ranks[i, j + 1]++;
                    a1[i1++] = v;
                }
                else a0[i0++] = v;
            }
            for (var j = 0; j < i0; j++) b[j] = a0[j];
            for (var j = 0; j < i1; j++) b[j + i0] = a1[j];
            sum[i, 0] = T.AdditiveIdentity;
            for (var j = 0; j < n; j++) sum[i, j + 1] = sum[i, j] + b[j].Item2;
            var tmp = a; a = b; b = tmp;
        }
        for (var i = 0; i < d; i++) for (var j = 1U; j <= n; j++) ranks[i, j] = j - ranks[i, j];
        (Rank0, Sum) = (ranks, sum);
    }

    public T Frequency(uint l, uint r, uint upper) // [l, r), [0, upper)
    {
        var (n, rank0, sum) = (Length, Rank0, Sum);
        var res = T.AdditiveIdentity;
        for (var i = d - 1; i >= 0; i--)
        {
            if (l >= r) break;
            var (l0, r0) = (rank0[i, l], rank0[i, r]);
            if ((upper & (1U << i)) > 0)
            {
                res += sum[i, r0] - sum[i, l0];
                var zeros = rank0[i, n];
                l += zeros - l0;
                r += zeros - r0;
            }
            else (l, r) = (l0, r0);
        }
        return res;
    }
}

class PointMap
{
    readonly WaveletMatrix<long> matrix;
    readonly uint[] xs;

    public PointMap((uint, uint, long)[] points)
    {
        var sorted = points.OrderBy(e => e.Item1);
        var xs = sorted.Select(e => e.Item1);
        var ys = sorted.Select(e => (e.Item2, e.Item3));
        matrix = new WaveletMatrix<long>(ys.ToArray());
        this.xs = xs.ToArray();
    }

    public long Sum((uint, uint) lowerLeft, (uint, uint) upperRight) // [lx, rx), [ly, ry)
    {
        var (lx, ly) = lowerLeft;
        var (rx, ry) = upperRight;
        if (lx > rx || ly > ry) return 0;
        return Sum(lx, ly, rx - lx, ry - ly);
    }

    public long Sum(uint x, uint y, uint dx, uint dy) // [x, x + dx), [y, y + dy)
    {
        var ux = uint.MaxValue;
        if (x <= ux - dx) ux = x + dx;
        var uy = uint.MaxValue;
        if (y <= uy - dy) uy = y + dy;
        var l = MinIndex(x);
        var r = MinIndex(ux);
        return matrix.Frequency(l, r, uy) - matrix.Frequency(l, r, y);
    }

    uint MinIndex(uint x)
    {
        var xs = this.xs;
        var (l, r) = (-1, xs.Length);
        while (r - l > 1)
        {
            var m = (l + r) >> 1;
            if (xs[m] < x) l = m; else r = m;
        }
        return (uint)r;
    }
}