#include<cstdio>
#include<algorithm>
using namespace std;
int countx[50010],county[50010];
long long get_answer(int points[50010],int length){
    int i,up=0,down=0;
    long long sum=0,answer=2000000000000000;
    for(i=50000;i>=length;i--){
        up+=points[i];
        sum+=up;
    }
    for(i=0;i<=50000-length;i++){
        sum-=up;
        up-=points[i+length];
        answer=min(answer,sum);
        down+=points[i];
        sum+=down;
    }
    return answer;
}
int main(){
    freopen("tribute.in","r",stdin);
    freopen("tribute.out","w",stdout);
    int n,dx,dy,x,y,i;
    scanf("%d%d%d",&n,&dx,&dy);
    for(i=1;i<=n;i++){
        scanf("%d%d",&x,&y);
        countx[x]++;
        county[y]++;
    }
    printf("%lld",get_answer(countx,dx)+get_answer(county,dy));
    return 0;
}