#include<fstream>
#include<algorithm>
using namespace std;
int x,y,a[50010],b[50010],rez,n;
ifstream cin ("tribute.in");
ofstream cout ("tribute.out");
int main(){
	cin >>n>>x>>y;
	for (int  i = 0; i<n; i++)cin >>a[i]>>b[i];
	sort(a,a+n);
	sort(b,b+n);
	for (int i = 0, j = n-1; j >=0 && i<n; i++, j--){
		rez+=max(a[i]-a[j]-x,0);
		rez+=max(b[i]-b[j]-y,0);
	}
	cout << rez;
}