#include<fstream>
#define NMax 50005
using namespace std;
ifstream fin("tribute.in");
ofstream fout("tribute.out");

int N,DX,DY,Sol;
int X[NMax],Y[NMax];

void Read()
{
    fin>>N>>DX>>DY;

    for(int i=1;i<=N;++i)
    {
        int x,y;    fin>>x>>y;
        X[x]++;
        Y[y]++;
    }
}

void Solve()
{
    int S=0,Solx,Soly;

    for(int i=DX;i<NMax;++i)
        S+=(X[i]*(i-DX));

    Solx=S;

    for(int i=1;i<NMax;++i)
        X[i] += X[i-1];

    for(int i=1;i+DX<NMax;++i)
    {
        S+=X[i-1];
        S-=N-X[i-DX+1];
        Solx = min(Solx,S);
    }

    S=0;

    for(int i=DY;i<NMax;++i)
        S+=(Y[i]*(i-DY));

    Soly=S;

    for(int i=1;i<NMax;++i)
        Y[i] += Y[i-1];

    for(int i=1;i+DY<NMax;++i)
    {
        S+=Y[i-1];
        S-=N-Y[i-DY+1];
        Soly = min(Soly,S);
    }

    Sol=Solx+Soly;
}

void Print()
{
    fout<<Sol<<"\n";
}

int main()
{
    Read();
    Solve();
    Print();

    fin.close();
    fout.close();
    return 0;
}