#nullable enable

int n, xMax, yMax;
{
    var input = Console.ReadLine()!.Split(' ');
    n = int.Parse(input[0]);
    xMax = int.Parse(input[1]);
    yMax = int.Parse(input[2]);
}
var xz = new long[n];
var yz = new long[n];
for (var i = 0; i < n; i++)
{
    var input = Console.ReadLine()!.Split(' ');
    xz[i] = int.Parse(input[0]);
    yz[i] = int.Parse(input[1]);
}

var ans = 0L;
for (var _i = 0; _i < 2; _i++)
{
    var h = xMax / 2;
    xz.AsSpan().Sort();
    var values = new List<long>(xz);
    foreach (var x in xz)
    {
        values.Add(x + h);
        values.Add(x + xMax);
    }
    values = values.Distinct().ToList();
    values.Sort();
    var m = values.Count;
    var reversed = new Dictionary<long, int>();
    for (var i = 0; i < m; i++) reversed[values[i]] = i;
    var cSum = new long[m + 1];
    var pSum = new long[m + 1];
    foreach (var x in xz)
    {
        var i = reversed[x] + 1;
        cSum[i]++;
        pSum[i] += x;
        var j = reversed[x + xMax] + 1;
        cSum[j]++;
        pSum[j] += x + xMax;
    }
    for (var i = 0; i < m; i++)
    {
        cSum[i + 1] += cSum[i];
        pSum[i + 1] += pSum[i];
    }
    var dx = 0L;
    foreach (var x in xz)
    {
        var l1 = reversed[x];
        var l2 = reversed[x + h];
        var r1 = l2 + 1;
        var r2 = reversed[x + xMax];
        var c1 = cSum[r1] - cSum[l1];
        var c2 = cSum[r2] - cSum[l2];
        var p1 = pSum[r1] - pSum[l1];
        var p2 = pSum[r2] - pSum[l2];
        dx = Math.Max(dx, c1 * (x + h) - p1 + p2 - c2 * (x + h));
    }
    ans += dx;
    (xMax, yMax) = (yMax, xMax);
    (xz, yz) = (yz, xz);
}
Console.WriteLine(ans);