#include <bits/stdc++.h>

using namespace std;
ifstream in("tribute.in");
ofstream out("tribute.out");
const int N = 50005;
typedef long long lint;
struct p
{
    lint x,y;
}v[N];
lint cnt[2][N], i1, i2, n;
lint solve()
{
    lint left=0,right=n,dist=0,Min = N;
    for (lint i = 0; i<=N; i++)
        dist+=cnt[1][i]*(i+1);
    for (lint i = 0; i<=N; i++)
    {
        dist-=right;
        right-=cnt[1][i];
        left+=cnt[0][i];
        dist+=left;
        Min = min(Min,dist);
    }
    return Min;
}
int main()
{
    lint dx,dy;
    in >> n >> dx >> dy;
    for (lint i = 1; i<=n; i++)
        in >> v[i].x >> v[i].y;
    for (lint i = 1; i<=n; i++)
    {
        cnt[1][v[i].x]++;
        cnt[0][v[i].x+dx+1]++;
    }
    lint Minx = solve();
    memset(cnt[0],0,sizeof(cnt[0]));
    memset(cnt[1],0,sizeof(cnt[1]));
    for (lint i = 1; i<=n; i++)
    {
        cnt[1][v[i].y]++;
        cnt[0][v[i].y+dy+1]++;
    }
    lint Miny = solve();
    out << Minx + Miny;
}