#nullable enable

using System.Numerics;

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 candidates = new List<int>();
    var g = new Complex(0, 0);
    foreach (var x in xz)
    {
        var arg = (double)(x - 1) / xMax * Math.PI * 2;
        g -= new Complex(Math.Cos(arg), Math.Sin(arg)) / n;
    }
    var c = 0;
    if (g.Magnitude > 1.0e-13) c = (int)(g.Phase / (Math.PI * 2) * xMax);
    var best = 0L;
    for (var i = -1; i <= 1; i++)
    {
        var t = (c + i + xMax) % xMax + 1;
        var score = 0L;
        foreach (var x in xz)
        {
            var l = Math.Min(x, t);
            var r = Math.Max(x, t);
            score += Math.Min(r - l, xMax - r + l);
        }
        best = Math.Max(best, score);
    }
    ans += best;
    (xMax, yMax) = (yMax, xMax);
    (xz, yz) = (yz, xz);
}
Console.WriteLine(ans);