#include <cstdio>

#define NMax 50005

using namespace std;

int N, DX, DY, PX[NMax+5], PY[NMax+5];

inline int Min (int a, int b)
{
    if (a<b)
    {
        return a;
    }
    return b;
}

inline int Solve (int V[], int D)
{
    int S, CurrentS=0;
    for (int i=D; i<NMax; ++i)
    {
        CurrentS+=((i-D)*V[i]);
    }
    S=CurrentS;
    for (int i=1; i<NMax; ++i)
    {
        V[i]+=V[i-1];
    }
    for (int i=1; i+D<NMax; ++i)
    {
        CurrentS+=V[i-1];
        CurrentS-=(N-V[i+D-1]);
        S=Min (S, CurrentS);
    }
    return S;
}

void Read ()
{
    freopen ("tribute.in", "r", stdin);
    scanf ("%d %d %d", &N, &DX, &DY);
    for (int i=1; i<=N; ++i)
    {
        int X, Y;
        scanf ("%d %d", &X, &Y);
        ++PX[X];
        ++PY[Y];
    }
}

void Print ()
{
    freopen ("tribute.out", "w", stdout);
    printf ("%d\n", Solve (PX, DX)+Solve (PY, DY));
}

int main()
{
    Read ();
    Print ();
    return 0;
}